Circumradius of the rectangle

Here we have a rectangle of length l & breadth b. We have to find the circumradius of the rectangle.

Examples:

Input : l = 3, b = 4 
Output :2.5

Input :l = 10, b = 12
Output :3.95227774224

👁 Image

Approach: 
From the diagram, we can clearly understand the circumradius r is half of the diagonal of the rectangle. 

Below is the implementation of the above approach: 

Output:

2.5

Time Complexity: O(1)

Auxiliary Space: O(1)