Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 10 - Section 10.4 - Analytic Proofs - Exercises - Page 480: 30

Answer

If the side lengths are a, b, and c and $a^2+b^2 =c^2$, then it is a right triangle.

Work Step by Step

We consider a triangle with side lengths a, b, and c. We consider the case where the angle is a right angle. If and only if this is the case, the distance c is: $c= \sqrt{a^2+b^2} \\ c^2 =a^2 +b^2$ If it was not a right triangle, this would not be the case. Thus, if the side lengths are a, b, and c and $a^2+b^2 =c^2$, then it is a right triangle.
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