# Law of Tangents

**Definition : **

In trigonometry, the law of tangents is also referred to as tangent law, tan formula, or tangent rule. It is defined as the equation relating to the length of the sides of a triangle to the tangents of its angles. It is the ratio of the length of the opposite side to the length of the adjacent side. The below given calculator assists you in calculating the value of tangent function from the known opposite and adjacent values.

#### Tangent Rule Calculator

### Formula :

Tan (α)

= Opposite Side / Adjacent Side