Distance between Incenter and Circumcenter of a triangle using Inradius and Circumradius

Given two integers r and R representing the length of Inradius and Circumradius respectively, the task is to calculate the distance d between Incenter and Circumcenter.

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Inradius The inradius( r ) of a regular triangle( ABC ) is the radius of the incircle (having center as l), which is the largest circle that will fit inside the triangle. 
Circumradius: The circumradius( R ) of a triangle is the radius of the circumscribed circle (having center as O) of that triangle. 

Examples: 

Input: r = 2, R = 5 
Output: 2.24

Input: r = 5, R = 12 
Output: 4.9

Approach: 
The problem can be solved using Euler's Theorem in geometry, which states that the distance between the incenter and circumcenter of a triangle can be calculated by the equation:

Below is the implementation of the above approach:

2.24

Time Complexity: O(logn) since time complexity of sqrt is O(logn)
Auxiliary Space: O(1)