Complementary Angles

Two acute angles are complementary if

Two acute angles are complementary if their sum equals 90°. For example, 30° and 60° are complementary because 30° + 60° = 90°. In general, if one ang

For complementary angles

For complementary angles: sin(90° - θ) = cos θ and cos(90° - θ) = sin θ. This means the sine of an angle equals the cosine of its complement, and vice

For complementary angles

For complementary angles: tan(90° - θ) = cot θ and cot(90° - θ) = tan θ. The tangent of an angle equals the cotangent of its complement.

For complementary angles

For complementary angles: sec(90° - θ) = cosec θ and cosec(90° - θ) = sec θ. The secant of an angle equals the cosecant of its complement.

In a right triangle ABC

In a right triangle ABC with right angle at B, if angle C = θ, then angle A = (90° - θ). All complementary angle relationships can be derived from thi