Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 4 - Congruent Triangles - 4-5 Isosceles and Equilateral Triangles - Lesson Check - Page 253: 1

Answer

a) 70 b) 53

Work Step by Step

For an isosceles triangle, the two angles created where the legs and the base meet are congruent. Thus, angle A is 70 degrees. For part b, the angle is marked as congruent. Thus, we know that angle A for part b measures 53 degrees as well.
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