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22 July, 10:24

In a right triangle that has one acute angle of 18 degrees, cos 18 degrees is congruent to?

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  1. 22 July, 13:28
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    cos (18°) = sin (72°)

    Step-by-step explanation:

    we know that

    In a right triangle

    cos (A) = sin (B)

    If A and B are complementary angles

    so

    A+B=90°

    In this problem

    A=18°

    B=90-18=72°

    therefore

    cos (18°) = sin (72°)
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