Through the radius of the inscribed circle

A circle is inscribed in a triangle if all three sides of the triangle are tangent to the circle. In this case, the circle is called the inscribed circle, and its center is called the inner center, or incenter. How to find the area of a triangle through the radius of an inscribed circle? The area of a triangle is equal to the product of the radius of the circle inscribed in this triangle by on its half-perimeter.