Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 3 - Section 3.5 - Inequalities in a Triangle - Exercises - Page 174: 40

Answer

M=60 degrees N=60 degrees

Work Step by Step

Since MNP is an isosceles triangle, we know that angles P and N are congruent. Since MQ and QP are congruent, we know that small angle P (QPM) and M are congruent. Since QP and NP are congruent, second small angle Q (PQN) and angle N are congruent. Thus, we find: $$2N+QPM=180 \\ 2N+M = 180 \\ 2M+ MQP=180 \\ QPM+MQP+M=180$$ Using these equations and the triangle congruence theorems, we find that M is equal to: $$ M=60 ^{\circ}$$ Thus, it follows: $$ 2N+60 =180 \\ N = 60^{\circ}$$
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