In any right triangle, the acute angles are complementary; that is, their sum is 90°. Use the trigonometric ratios to verify that the sine of an angle is equal to the cosine of its complement.

Skip to content
# In any right triangle, the acute angles are complementary; that is, their sum is 90°. Use the trigonometric ratios to verify that the sine of an angle is equal to the cosine of its complement.

In any right triangle, the acute angles are complementary; that is, their sum is 90°. Use the trigonometric ratios to verify that the sine of an angle is equal to the cosine of its complement.