Prove that if a Pythagorean Triangle has even sides, then its perimeter, P, divides its area, A.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter3: Triangles
Section3.4: Basic Constructions Justified
Problem 38E
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Prove that if a Pythagorean Triangle has even sides, then its perimeter, P, divides
its area, A.
Transcribed Image Text:Prove that if a Pythagorean Triangle has even sides, then its perimeter, P, divides its area, A.
last equation can be expressed as
(a + B)(a - B) = 1.
wwww
All the numbers concerned are rational, so if the product of two numbers is 1, they are
O reciprocals. That is, one number must be m/n and the other n/m, where m and n are
t integers. Setting
a + B =
and
a - B =
we nd by addition that
m
and by subtraction that
1
1 (m
B =
Consequently,
m² + n²
m2 -n²
wwww
(1)
2mn
2mn
But y = Bx and z = ax; if we now put x = 2mn, so as to get a solution in integers, it
follows that
=2mn.
y = m-n².
z = m? + n2.
=%²
r
wwwww
These are well-known formulas for nding right triangles with sides of integral length and
were used in Hellenistic times by Diophantus (circa 150), the most original mathematician
of late antiquity.
Transcribed Image Text:last equation can be expressed as (a + B)(a - B) = 1. wwww All the numbers concerned are rational, so if the product of two numbers is 1, they are O reciprocals. That is, one number must be m/n and the other n/m, where m and n are t integers. Setting a + B = and a - B = we nd by addition that m and by subtraction that 1 1 (m B = Consequently, m² + n² m2 -n² wwww (1) 2mn 2mn But y = Bx and z = ax; if we now put x = 2mn, so as to get a solution in integers, it follows that =2mn. y = m-n². z = m? + n2. =%² r wwwww These are well-known formulas for nding right triangles with sides of integral length and were used in Hellenistic times by Diophantus (circa 150), the most original mathematician of late antiquity.
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