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Following program shows you how to calculate circle area.
In this tutorial will get circle radius from user and calculate area and prints it using following formula
Area = PI X r X r

#include <iostream>
#include <math.h>

int main() {
    float circleRadius;

    std::cout << "Please enter the radius of circle:";
    std::cin >> circleRadius;

    float areaOfCircle = 22 / 7 * (circleRadius * circleRadius);

    std::cout << "Area of circle is: " << areaOfCircle;


Please enter the radius of circle: 12
Area of circle is: 432

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