Geometry Trigonometry Review

Sine (sin) is the ratio of the length of the opposite side to the length of the hypotenuse (o/h).

Cosine (cos) is the ratio of the length of the adjacent side to the length of the hypotenuse (a/h).

Tangent (tan) is the ratio of the length of the opposite side to the length of the adjacent side (o/a).

To find the angle, use the inverse sine function: angle = sin^(-1)(opposite/hypotenuse).

To find the angle, use the inverse cosine function: angle = cos^(-1)(adjacent/hypotenuse).

To find the angle, use the inverse tangent function: angle = tan^(-1)(opposite/adjacent).

In a right triangle, a² + b² = c², where c is the hypotenuse and a and b are the other two sides.

sin(θ) = 3/5.

cos(θ) = 4/5.

tan(θ) = 3/4.