Area of Incircle of a Right Angled Triangle

Given the P, B and H are the perpendicular, base and hypotenuse respectively of a right angled triangle. The task is to find the area of the incircle of radius r as shown below:
 

👁 Image

Examples: 
 

Input: P = 3, B = 4, H = 5 
Output: 3.14
Input: P = 5, B = 12, H = 13 
Output: 12.56 
 

Approach: Formula for calculating the inradius of a right angled triangle can be given as r = ( P + B - H ) / 2. 
And we know that the area of a circle is PI * r² where PI = 22 / 7 and r is the radius of the circle. 
Hence the area of the incircle will be PI * ((P + B - H) / 2)².
Below is the implementation of the above approach:
 

3.141593

Time Complexity : O(1)

Auxiliary Space: O(1)