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1. Trisection Of An Angle
And that makes it equivalent to the attempted trisection 1 above, and is not areal trisection of angle A. Again, this is not a real trisection of angle A.
http://www.jimloy.com/geometry/trisect.htm
##### Trisection of an Angle
Under construction (just kidding, sort of). This page is divided into seven parts: Part I - Possible vs. Impossible In Plane Geometry, constructions are done with compasses (for drawing circles and arcs, and duplicating lengths, sometime called "a compass") and straightedge (without marks on it, for drawing straight line segments through two points). See Geometric Constructions . With these tools (see the diagram), an amazing number of things can be done. But, it is fairly well known that it is impossible to trisect (divide into three equal parts) a general angle, using these tools. Another way to say this is that a general arc cannot be trisected. The public and the newspapers seem to think that this means that mathematicians don't know how to trisect an angle; well they don't, not with these tools. But they can estimate a trisection to any accuracy that you want. What can be done with these tools? Given a length

2. Sci.math FAQ: The Trisection Of An Angle
sci.math FAQ The trisection of an angle. There are reader questions on this topic! Help others by sharing your knowledge Version 7.5 The trisection of an angle Theorem 4. The trisection of the
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##### sci.math FAQ: The Trisection of an Angle
There are reader questions on this topic!
Help others by sharing your knowledge
Newsgroups: sci.math alopez-o@neumann.uwaterloo.ca alopez-o@unb.ca http://daisy.uwaterloo.ca/~alopez-o Assistant Professor Faculty of Computer Science University of New Brunswick Rate this FAQ N/A Worst Weak OK Good Great
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alopez-o@neumann.uwaterloo.ca Last Update June 05 2004 @ 00:23 AM

3. AllRefer Encyclopedia - Trisection Of An Angle (Mathematics) - Encyclopedia
AllRefer.com reference and encyclopedia resource provides complete information on trisection of an angle, Mathematics. Includes related research links. Reference Encyclopedia Mathematics trisection of an angle. By Alphabet Encyclopedia AZ trisection of an angle see geometric problems of antiquity
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• 4. Proof
trisection of an angle. Proof that one of the illegal methods (by Archimedes)does indeed trisect an angle. Impossibility proof trisection of an angle.
http://www.jimloy.com/math/proof.htm
##### Proof
The average person does not have a firm grasp of the meaning of the word "proof." He/she may hear that someone saw a UFO, and consider that a proof that we are being visited by creatures from outer space. They may see a blinding light, just before dying (and then recover) and consider that proof of heaven. Instead, these are examples of evidence (and flimsy evidence at that), and not proof. But these people live in a world in which nothing is certain. In such a world, "proof" does not have much meaning. Mathematicians (and scientists to a large extent) live in a world in which some things are certain. Mathematicians have Euclid's (and other people's) axioms, postulates, and theorems. Physicists have Newton's (and other people's) laws. These are ideas that are so basic that it would be silly to deny them (under normal circumstances). And mathematicians and scientists use these postulates, theorems, and laws to deduce other theorems and laws. This is proof. There are several kinds of proof:
• Direct proof: Show that the intended theorem can be deduced from basic truths. Start with the basic principles, end with what you are trying to prove.

5. The Trisection Of An Angle
The trisection of an angle. In particular, the equation for degrees cannot be solvedby ruler and compass and thus the trisection of the angle is not possible.
http://db.uwaterloo.ca/~alopez-o/math-faq/node57.html
Next: Which are the Up: Famous Problems in Mathematics Previous: The Four Colour Theorem
##### The Trisection of an Angle
This problem, together with Doubling the Cube Constructing the regular Heptagon and Squaring the Circle were posed by the Greeks in antiquity, and remained open until modern times. The solution to all of them is rather inelegant from a geometric perspective. No geometric proof has been offered [check?], however, a very clever solution was found using fairly basic results from extension fields and modern algebra. It turns out that trisecting the angle is equivalent to solving a cubic equation. Constructions with ruler and compass may only compute the solution of a limited set of such equations, even when restricted to integer coefficients. In particular, the equation for degrees cannot be solved by ruler and compass and thus the trisection of the angle is not possible. It is possible to trisect an angle using a compass and a ruler marked in 2 places. Suppose X is a point on the unit circle such that is the angle we would like to ``trisect''. Draw a line

6. The Trisection Of An Angle
The trisection of an angle. Theorem 4. The trisection of the angle byan unmarked ruler and compass alone is in general not possible.
http://db.uwaterloo.ca/~alopez-o/math-faq/mathtext/node28.html
Next: Which are the 23 Up: Famous Problems in Mathematics Previous: The Four Colour Theorem
##### The Trisection of an Angle
Theorem 4. The trisection of the angle by an unmarked ruler and compass alone is in general not possible. This problem, together with Doubling the Cube Constructing the regular Heptagon and Squaring the Circle were posed by the Greeks in antiquity, and remained open until modern times. The solution to all of them is rather inelegant from a geometric perspective. No geometric proof has been offered [check?], however, a very clever solution was found using fairly basic results from extension fields and modern algebra. It turns out that trisecting the angle is equivalent to solving a cubic equation. Constructions with ruler and compass may only compute the solution of a limited set of such equations, even when restricted to integer coefficients. In particular, the equation for theta = 60 degrees cannot be solved by ruler and compass and thus the trisection of the angle is not possible. It is possible to trisect an angle using a compass and a ruler marked in 2 places.

7. Angle Trisection
Origami trisection of an angle. How can you trisect an angle? However,in origami, you can get accurate trisection of an acute angle.
http://hverrill.net/pages~helena/origami/trisect/
http://hverrill.net/pages~helena/origami/trisect/
##### Origami Trisection of an angle
How can you trisect an angle? It can be shown it's impossible to do this with ruler and compass alone, (using Galois theory) - so don't try it!!! But you may be able to find some good approximations. However, in origami, you can get accurate trisection of an acute angle. You can read about this in several places, but since it's so neat, I thought I'd put instructions up here too - more people should be able to do this for a party trick! Jim Loy has informed me that this construction is due to to Hisashi Abe in 1980, (see "Geometric Constructions" by George E. Martin). See Jim Loy's page at http://www.jimloy.com/geometry/trisect.htm for a description of many other ways to trisec an angle. Since we're working with origami, the angle is in a piece of paper: So what we want is to find how to fold along these dotted lines: Note, if you don't start with a square, you can always make a square, here's the idea. We're going to trisect this angle by folding. I'm going to try and describe this in a way so that you'll remember what to do. Suppose we could put three congruent triangles in the picture as shown: These triangles trisect the angle. So we need to know how to get them there.

8. Angle Trisection
http//hverrill.net/pages~helena/origami/ trisect/ Origami trisection of an angle. How can you trisect an angle? It can be shown it's impossible to do this with ruler and compass alone, (using Galois
http://www.hverrill.net/pages~helena/origami/trisect
http://hverrill.net/pages~helena/origami/trisect/
##### Origami Trisection of an angle
How can you trisect an angle? It can be shown it's impossible to do this with ruler and compass alone, (using Galois theory) - so don't try it!!! But you may be able to find some good approximations. However, in origami, you can get accurate trisection of an acute angle. You can read about this in several places, but since it's so neat, I thought I'd put instructions up here too - more people should be able to do this for a party trick! Jim Loy has informed me that this construction is due to to Hisashi Abe in 1980, (see "Geometric Constructions" by George E. Martin). See Jim Loy's page at http://www.jimloy.com/geometry/trisect.htm for a description of many other ways to trisec an angle. Since we're working with origami, the angle is in a piece of paper: So what we want is to find how to fold along these dotted lines: Note, if you don't start with a square, you can always make a square, here's the idea. We're going to trisect this angle by folding. I'm going to try and describe this in a way so that you'll remember what to do. Suppose we could put three congruent triangles in the picture as shown: These triangles trisect the angle. So we need to know how to get them there.

9. Trisection Of An Angle
trisection of an angle. post a message on this topic. post a message on a new topic. 28 Jun 1998 trisection of an angle, by David Wayne. 29 Jun 1998. Re trisection of an angle, by John Conway. 4 Jul
http://mathforum.com/epigone/geom.puzzles/chendswoljil
a topic from geom.puzzles
##### Trisection of an angle
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28 Jun 1998 Trisection of an angle , by David Wayne
29 Jun 1998 Re: Trisection of an angle , by John Conway
4 Jul 2003 Trisection of an angle , by victor morales
5 Jul 2003 Re: Trisection of an angle , by Rouben Rostamian
5 Jul 2003 Reply to "Trisection of an angle" , by Stephen Brian
6 Jul 2003 Re: Trisection of an angle , by maky m.
14 Jul 2003 Re: Trisection of an angle , by June8
15 Jul 2003 Re: Trisection of an angle , by Avni Pllana
16 Jul 2003 Re: Trisection of an angle , by John Conway 15 Jul 2003 Reply to "Re: Trisection of an angle" , by Stephen Brian 16 Jul 2003 Re: Trisection of an angle , by maky m. 23 Jul 2003 Re: Trisection of an angle , by Avni Pllana The Math Forum

ca!neumann.uwaterloo.ca!alopezo From alopez-o@neumann.uwaterloo.ca (Alex Lopez-Ortiz)Subject sci.math FAQ The trisection of an angle Summary Part 18 of 31

11. [HM] Approximate Euclidean Angle-trisection (was 1755 Or 1775?) By Edwin Clark
An approximate construction for the trisection of an angle. ( Dutch) Simon Stevin 27, (1950). 6970 A simple construction for the approximate trisection of an angle. Amer. Math
http://mathforum.com/epigone/historia/speesmaheld/Pine.GSO.4.21.0108160603410.11
##### [HM] Approximate Euclidean angle-trisection (was 1755 or 1775?) by Edwin Clark
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Subject: [HM] Approximate Euclidean angle-trisection (was 1755 or 1775?) Author: eclark@math.usf.edu Date: http://www.math.usf.edu/~eclark/ The Math Forum

12. Nicomedes
the curve. The conchoid can be used in solving both the problems oftrisection of an angle and of the duplication of a cube. Both
http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Nicomedes.html
##### Nicomedes
Click the picture above
to see a larger version Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index
We know nothing of Nicomedes ' life. To make a guess at dating his life we have some limits which are given by references to his work. Nicomedes himself criticised the method that Eratosthenes used to duplicate the cube and we have made a reasonably accurate guess at Eratosthenes 's life span (276 BC - 194 BC). A less certain piece of information comes from Apollonius choosing to name a curve 'sister of the conchoid' which is assumed to be a name he has chosen to compliment Nicomedes' discovery of the conchoid. Since Apollonius lived from about 262 BC to 190 BC these two pieces of information give a fairly accurate estimate of Nicomedes' dates. However, as we remarked the second of these pieces of information cannot be relied on but nevertheless, from what we know of the mathematics of Nicomedes, the deduced dates are fairly convincing. Nicomedes is famous for his treatise On conchoid lines which contain his discovery of the curve known as the conchoid of Nicomedes. How did Nicomedes define the curve. Consider the diagram. We are given a line

13. Fw: Approximate Trisection Of An Angle Iteratively By Panagiotis Stefanides
Fw Approximate trisection of an angle Iteratively by Panagiotis Stefanides. replyto this message post a message on a new topic Back to geometrycollege
http://mathforum.org/epigone/geometry-college/foukaxsou
##### Fw: Approximate Trisection of an Angle Iteratively by Panagiotis Stefanides
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Back to geometry-college
Subject: Fw: Approximate Trisection of an Angle Iteratively Author: panamars@otenet.gr Date: Wed, 5 May 2004 23:38:45 +0300 Lou, I, hold a copy (Greek)of the : FAMOUS UNSOLVED GEOMETRIC PROBLEMS OF ANTIQUITY by:M.A. MBRIKAS (Professor of Athens University) Edition : Athens 1970 Printing by A.A. Papaspyrou. Chapter 3rd :TRISECTION OF THE ANGLE Page107 : - -the problem - -the solution of Hippias, - -the solutions of Archimedes, - -the solution of Nicodemus, - -the solutions of Pappus, - -the solution of Pascal, - -the solution of CÃ©va, - -the solution of Mac Laurin, - -the solution of Delanges, - -the solution of Plateau, - -the solutio of Longchamps, - -Mechanical trisectors. Regards, Panagiotis Stefanides http://www.stefanides.gr http://clem.mscd.edu/~talmanl The Math Forum

14. Approximate Trisection Of An Angle Iteratively
a topic from geometrycollege Approximate trisection of an angle Iteratively.post a message on this topic post a message on a new topic
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##### Approximate Trisection of an Angle Iteratively
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5 May 2004 Approximate Trisection of an Angle Iteratively , by Eur Ing Panagiotis Stefanides
5 May 2004 Re: Approximate Trisection of an Angle Iteratively , by Lou Talman
5 May 2004 Re: Approximate Trisection of an Angle Iteratively , by Eur Ing Panagiotis Stefanides
5 May 2004 Re: Approximate Trisection of an Angle Iteratively , by Lou Talman
5 May 2004 Re: Approximate Trisection of an Angle Iteratively , by Vladimir Zajic
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6 May 2004 RE: Approximate Trisection of an Angle Iteratively , by Michael Lambrou
6 May 2004 RE: Approximate Trisection of an Angle Iteratively , by Eur Ing Panagiotis Stefanides
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15. Trisection Of An Angle. The Columbia Encyclopedia, Sixth Edition. 2001
The Columbia Encyclopedia, Sixth Edition. 2001. trisection of an angle. seegeometric problems of antiquity. The Columbia Encyclopedia, Sixth Edition.
http://www.bartleby.com/65/x-/X-trisecti.html
 Select Search All Bartleby.com All Reference Columbia Encyclopedia World History Encyclopedia Cultural Literacy World Factbook Columbia Gazetteer American Heritage Coll. Dictionary Roget's Thesauri Roget's II: Thesaurus Roget's Int'l Thesaurus Quotations Bartlett's Quotations Columbia Quotations Simpson's Quotations Respectfully Quoted English Usage Modern Usage American English Fowler's King's English Strunk's Style Mencken's Language Cambridge History The King James Bible Oxford Shakespeare Gray's Anatomy Farmer's Cookbook Post's Etiquette Bulfinch's Mythology Frazer's Golden Bough All Verse Anthologies Dickinson, E. Eliot, T.S. Frost, R. Hopkins, G.M. Keats, J. Lawrence, D.H. Masters, E.L. Sandburg, C. Sassoon, S. Whitman, W. Wordsworth, W. Yeats, W.B. All Nonfiction Harvard Classics American Essays Einstein's Relativity Grant, U.S. Roosevelt, T. Wells's History Presidential Inaugurals All Fiction Shelf of Fiction Ghost Stories Short Stories Shaw, G.B. Stein, G. Stevenson, R.L. Wells, H.G. Reference Columbia Encyclopedia PREVIOUS NEXT ... BIBLIOGRAPHIC RECORD The Columbia Encyclopedia, Sixth Edition. trisection of an angle see geometric problems of antiquity CONTENTS INDEX GUIDE ... Click here to download the Dictionary and Thesaurus Search Amazon: Click here to shop the Bartleby Bookstore Welcome Press Advertising ... Bartleby.com

16. Angle. The Columbia Encyclopedia, Sixth Edition. 2001
Two angles that add up to a straight angle are supplementary. One ofthe geometric problems of antiquity is the trisection of an angle.
http://www.bartleby.com/65/an/angle.html
 Select Search All Bartleby.com All Reference Columbia Encyclopedia World History Encyclopedia Cultural Literacy World Factbook Columbia Gazetteer American Heritage Coll. Dictionary Roget's Thesauri Roget's II: Thesaurus Roget's Int'l Thesaurus Quotations Bartlett's Quotations Columbia Quotations Simpson's Quotations Respectfully Quoted English Usage Modern Usage American English Fowler's King's English Strunk's Style Mencken's Language Cambridge History The King James Bible Oxford Shakespeare Gray's Anatomy Farmer's Cookbook Post's Etiquette Bulfinch's Mythology Frazer's Golden Bough All Verse Anthologies Dickinson, E. Eliot, T.S. Frost, R. Hopkins, G.M. Keats, J. Lawrence, D.H. Masters, E.L. Sandburg, C. Sassoon, S. Whitman, W. Wordsworth, W. Yeats, W.B. All Nonfiction Harvard Classics American Essays Einstein's Relativity Grant, U.S. Roosevelt, T. Wells's History Presidential Inaugurals All Fiction Shelf of Fiction Ghost Stories Short Stories Shaw, G.B. Stein, G. Stevenson, R.L. Wells, H.G. Reference Columbia Encyclopedia PREVIOUS NEXT ... BIBLIOGRAPHIC RECORD The Columbia Encyclopedia, Sixth Edition. angle /2 radians; the sides of a right angle are perpendicular to one another. An angle less than a right angle is acute, and an angle greater than a right angle is obtuse. Two angles that add up to a right angle are complementary. Two angles that add up to a straight angle are supplementary. One of the

17. ÂpÂÃÂOÂÂÂÂª Trisection Of An Angle
The summary for this Japanese page contains characters that cannot be correctly displayed in this language/character set.
http://www.nn.iij4u.or.jp/~hsat/misc/math/trisect.html
##### ÂpÂÃÂOÂÂÂÂª trisection of an angle
February, 2nd March, 2001.

18. Trisection Of An Angle
At last! I have proved the trisection of an angle using successive approximations! Youhave just trisected an angle using successive approximations.
http://www.flwyd.dhs.org/trisection.html
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##### Note
I wrote this a couple years ago while I was taking geometry. I know it is not precise, but it is nice to see. At last! I have proved the trisection of an angle using successive approximations! This is set up for a graphical browser. If you don't have a graphical browser, you MAY be able to follow it, but it would be a good idea to download the picture. If you wish to be more accurate, split the arc into 6 segments, then 9, etc. Then take the endpoint of the segment one third the distance from the midpoint (with 3 segments it would be the segment next to the midpoint, with 6 the second segment from the midpoint, etc.) and connect it to the vertex. Congratulations! You have just trisected an angle using successive approximations. The exactness depends on how many segments you split the arc into. Back to my homepage