Question

If the cos 36° = three fourths, then the sin 54° = _____.

one half, because the angles are complementary
4 over 3, because the angles are supplementary
three fourths, because the angles are complementary
1, because the angles are complementary

Answer 1

Answer:

three fourths, because the angles are complementary

Step-by-step explanation:

$\cos 36 \degree = \frac{3}{4} \\ \therefore \: \sin(90 - 36) \degree = \frac{3}{4} \\ \therefore \: \sin54\degree = \frac{3}{4} \\ \\ formula \: used : \\ \cos \theta = \sin(90 - \theta)$

Answer 2

Answer:

3/4 because the angles are complementary.

Step-by-step explanation:

I just did the test and got it right. :)