Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 8 - 8.1 - Law of Sines - 8.1 Exercises - Page 568: 55


True. If an angle is greater than 90° then the sum of the two others must be less than 90° which implies it is not a right angled triangle.

Work Step by Step

That is, suppose $A=100°\gt90°$. Then $B+C=80°$. So, $B\lt90°$ and $C\lt90°$ We have that $A\ne90°, B\ne90°,C\ne90°$
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