# Tangent of an Angle

The ratios of the lengths of different sides of a right angled triangle are known as trigonometric ratios. These ratios are sine, cosine, tangent, cotangent, cosecant, secant. The sides of a right angle triangle can be seen as given here.

In a right angled triangle the tangent of an angle is the ratio of the length of the perpendicular to the ratio of the length of its base. The perpendicular can be termed as adjacent and the base as opposite.

The tangent of an angle can be measured in degree or radians. The opposite of tangent is known as cotangent. The cotangent of an angle is the ratio of the length of the base to the length of the perpendicular.