In this C++ program, we will calculate circumference and area of circle given radius of the circle.
The area of circle is the amount of two-dimensional space taken up by a circle. We can calculate the area of a circle if you know its radius. Area of circle is measured in square units.
Where, Where PI is a constant which is equal to 22/7 or 3.141(approx)
C++ Program to Find Area of Circle
#include <iostream>
using namespace std;
#define PI 3.141
int main(){
float radius, area;
cout << "Enter radius of circle\n";
cin >> radius;
// Area of Circle = PI x Radius X Radius
area = PI*radius*radius;
cout << "Area of circle : " << area;
return 0;
}
Output
Enter radius of circle 7 Area of circle : 153.909
In above program, we first take radius of circle as input from user and store it in variable radius. Then we calculate the area of circle using above mentioned formulae and print it on screen using cout.
C++ Program to Find Circumference of Circle
Circumference of circle is the length of the curved line which defines the boundary of a circle. The perimeter of a circle is called the circumference.
We can compute the circumference of a Circle if you know its radius using following formulae.
We can compute the circumference of a Circle if you know its diameter using following formulae.
#include <iostream>
using namespace std;
#define PI 3.141
int main(){
float radius, circumference;
cout << "Enter radius of circle\n";
cin >> radius;
// Circumference of Circle = 2 X PI x Radius
circumference = 2*PI*radius;
cout << "Circumference of circle : " << circumference;
return 0;
}
Output
Enter radius of circle 7 Circumference of circle : 43.974
In above program, we first take radius of circle as input from user and store it in variable radius. Then we calculate the circumference of circle using above mentioned formulae and print it on screen using cout.
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