# Side of triangle

To find the side of a triangle, knowing its two sides and the angle between them, you can use the cosine theorem. To do this, you need to extract the square root of the sum of the squares of the known sides and the difference with their double product by the cosine of the angle between them.

.**Side length of a triangle****зная две стороны и угол между ними**

**Triangle angle α (degree)**

**Side length of a triangle b**

**Side length of a triangle c**