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Area of a circle inscribed in a rectangle which is inscribed in a semicircle?
Let us consider one semicircle is given. Its radius is R. One rectangle of length l and breadth b is inscribed in that semi-circle. Now one circle with radius r is inscribed in the rectangle. We have to find the area of the inner circle.
As we know biggest rectangle that can be inscribed within the semi-circle has length l and breadth b, then the equation of l and b will be like following −
Now, the biggest circle that can be inscribed within the rectangle has radius r is like below −
Example
#include <iostream> #include <cmath> using namespace std; float innerCircleArea(float R){ return 3.1415 * pow(R / (2 * sqrt(2)), 2); } int main() { float rad = 12.0f; cout << "Area: " << innerCircleArea(rad); }
Output
Area: 56.547
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