Question

what is the formula to find semi perimeter of the triangle​

Answer 1

Answer:

We recall the dentition of length of sides of a triangle, the perimeter of the triangle and then semi-perimeter. We add the given lengths of triangles to get the perimeter of the triangle and divide the perimeter by 2 to get the semi-perimeter.

Answer 2

In any triangle, the distance along the boundary of the triangle from a vertex to the point on the opposite edge touched by an excircle equals the semiperimeter.