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Trigonometry

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Complementary Angles: Radian Measure, Right Angle

TRIG-QNNC6B

James Gunnin Created for Albert.io. Copyright 2016. All rights reserved

Given the above figure, what value, in radian measure, for $ \theta$ would prove that angle CAB is a right triangle?

A

$ \theta =\cfrac { 5 \pi }{ 12 }$

B

$ \theta =\cfrac { 11 \pi }{ 12 }$

C

$ \theta =\cfrac { 7 \pi }{ 12 }$

D

$ \theta =\cfrac { 13 \pi }{ 12 }$