The secant of an angle in a right triangle is the ratio of the length of the hypotenuse to the length of the adjacent side.
The tangent of an angle in a right triangle is the ratio of the length of the opposite side to the length of the adjacent side.
Cosine: The cosine of an angle in a right triangle is the ratio of the length of the adjacent side to the length of the hypotenuse.
Sine: The sine of an angle in a right triangle is the ratio of the length of the opposite side to the length of the hypotenuse.