Incircle of a Triangle

1. Incircle of a Triangle
   The circle is the incircle of triangle , and the points and are the points of tangency.
2. The perimeter of triangle is:
   
2. Incircle of a Right Triangle
   In a right triangle where , the radius of the incircle is .
1. The quadrilateral is a square with side length .
2. The area of triangle is: