How do you find the sine, cosine, and tangent of an angle in a right triangle?

To find the sine, cosine, and tangent of an angle in a right triangle, use the following definitions: Sine (sin) is the ratio of the length of the opposite side to the hypotenuse. Cosine (cos) is the ratio of the length of the adjacent side to the hypotenuse. Tangent (tan) is the ratio of the length of the opposite side to the adjacent side. These ratios are fundamental trigonometric functions.