Geometry: Common Core (15th Edition)

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

Chapter 12 - Circles - 12-1 Tangent Lines - Got It? - Page 763: 1



Work Step by Step

We know that one angle in a triangle is 90 degrees. We also know that the sum of the angles in a triangle is 180 degrees. Thus, the missing angle is: $$ =180-90-38=72^\circ$$
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