Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 1 - Section 1.1 - Angles, Degrees, and Special Triangles - 1.1 Problem Set - Page 11: 12


$ 90^{\circ}$ is neither acute nor obtuse angle. It is a right angle. Complement of $ 90^{\circ}$ = $ 0^{\circ}$ Supplement of $ 90^{\circ}$ = $90^{\circ}$

Work Step by Step

$ 90^{\circ}$ is a right angle as angles that measure $90° $ are called right angles. Complement of $ 90^{\circ}$ = $ 90^{\circ} - 90^{\circ}$ = $ 0^{\circ}$ (As sum of the measures of complementary angles is 90 degrees, we can find 'one' by subtracting 'other' from $90^{\circ}$ ) Supplement of $ 90^{\circ}$ = $ 180^{\circ} - 90^{\circ}$ = $ 90^{\circ}$ (As sum of the measures of supplementary angles is 180 degrees, we can find 'one' by subtracting 'other' from $180^{\circ}$)
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