Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 1 - Test: 7



Work Step by Step

1. The exterior angle is equal to the sum of the two other angles 12x+40=12x+8x 20x-12x=40 8x=40 x=5 2. Plug x in to find the angles: 12(5)=60 8(5)=40 3rd angle: 180-40-60=80
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