C Program to calculate perimeter and area of a circle, take radius as input.
//C program to find area and perimeter of a circle
#include<stdio.h>
int main() {
//In circle pi = 3.14
float radius, perimeter, area, pi=3.14;
printf(“nEnter the radius of Circle : “);
scanf(“%f”, &radius);
// Perimeter of circle = 2πr
perimeter = 2 * pi * radius;
printf(“nPerimeter of Circle : %f”, perimeter);
//Area of circle = π*r*r
area = pi * radius * radius;
printf(“nArea of Circle : %f”, area);
return (0);
}
Output: