Trigonometric Ratios

Trigonometric Ratios

In a right triangle, the following trigonometric ratios can be defined:

Sine

The sine of the angle B is the ratio between the length of the opposite side and the hypotenuse of the triangle.

It is denoted by sin B.

Sine Ratio


Cosine

The cosine of the angle B is the ratio between the length of the adjacent side and the hypotenuse of the triangle.

It is denoted by cos B.

Cosine Ratio


Tangent

The tangent of the angle B is the ratio between the length of the opposite side and the adjacent side of the triangle.

It is denoted by tan B.

Tangent Ratio


Cosecant

The cosecant of angle B is the inverse of the sine of B.

It is denoted by csc B.

Cosecant Ratio


Secant

The secant of angle B is the inverse of the cosine of B.

It is denoted by sec B.

Secant Ratio


Cotangent

The cotangent of the angle B is the inverse of the tangent of B.

It is denoted by cot B.

Cotangent Ratio