Cut the knot: learn to enjoy mathematics
A math books store at a unique math study site. Shopping at the store helps maintain the site. Thank you.
Ask a tutor for free
Learning Math Online

Sites for parents
Terms of use
Awards
Interactive Activities

CTK Exchange
CTK Wiki Math
CTK Insights - a blog
Math Help

III Millennium Olympiad

Games & Puzzles
What Is What
Arithmetic/Algebra
Geometry
Probability
Outline Mathematics
Make an Identity
Book Reviews
Stories for Young
Eye Opener
Analog Gadgets
Inventor's Paradox
Did you know?...
Proofs
Math as Language
Things Impossible
Visual Illusions
My Logo
Math Poll
Cut The Knot!
MSET99 Talk
Other Math sites
Front Page
Movie shortcuts
Personal info
Privacy Policy

Guest book
News sites

Recommend this site

Sites for parents

Education & Parenting

Manifesto  |  Bookstore  |  Contents  |  Amazon store  |  Term index  |  What changed?  |  Contact  |  Recommend
RSS Feed: Recent changes at CTK

Subject: More on Pythagorean triples, II
Date: Sun, 5 Apr 1998 15:59:14 -0300
From: Gerald Briggs

Were you aware that there is a special irrational number which is linked to a set of pythagorean triples which I, for lack of any other nomenclature I have found on this, have named the perfect-primitive-pythagorean triples. The first triangle that belongs to this set is (3,4,5) and the second is (20,21,29). The third such triangle is (119,120,169) and the fourth is (696,697,985). These are pythagorean triples (a,b,c) by the fact that a^2 + b^2 = c^2, and a,b, and c are integers. The distinct feature here is that each triangle's two non-hypoteneuse sides are exactly one apart. If you take the number (2^0.5 + 1)^2 and multiply it onto the hypoteneuse of the last triple (ie 5.8284268 * 985 = 5741.0003) you find with near perfect precision the next larger hypoteneuse corresponding with the next larger perfect-primitive-pythagorean triple (4059,4060,5741). The 4059 and 4060 are found by dividing the 5741 by the square root of 2 and adding a half to get 4060.0002 and subtracting a half to get 4059.0002. The next precision is even better (5.8284268 * 5741= 33460.999) yielding 33461 as the next hypoteneuse. In essence, what seems peculiar is that irrational numbers are being used to approximate integers instead of vice-versa. What kind of field of mathematics can prove that these triangles exist in such perfect order? Is there any depth to this phenomenon?

Please return a response,

    Anxious, Gerald Briggs

 

 

Copyright © 1996-2009 Alexander Bogomolny

34385372Page copy protected against web site content infringement by Copyscape

Search:
Keywords:

Google
Web CTK