Radius of the circle inscribed in a triangle

This online calculator is designed to find the radius of a circle that touches all sides of a triangle, called the inscribed circle. To use the calculator, you need to enter the lengths of the three sides of the triangle.

To find the radius of the circle inscribed in the triangle if the lengths of its sides are known a, b, c , you can use the following formula:
r = √((s - a)(s - b)(s - c) / s)
where s - semi-perimeter of the triangle, calculated as s = (a + b + c) / 2 .