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: 3


23, 134

Work Step by Step

Since the measure of one base angle is 23 degrees, we know that the measure of the other base angle is 23 degrees as well by the definition of an isosceles triangle. Since the sum of the interior angles is 180 degrees, we find the third angle is: 180-23-23=134.
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