Given that sin 40° = 0.6428, which angle has the cosine value of 0.6428?
A)140°
B)40°
C)130°
D)50°

Name: Given that sin 40° = 0.6428, which angle has the cosine value of 0.6428? A)140° B)40° C)130° D)50°
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Question

Quizplus · Accepted Answer

The cosine of an angle in a right triangle is equal to the sine of its complement. Since the given angle is 40°, its complement is 50°, making the cosine of 50° equal to the sine of 40°, which is 0.6428.

Given That Sin 40° = 0