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#include<stdio.h> #define pi 3.14 void main() { int r; float p; printf("Enter the value of radius: "); scanf("%d", &r); p=2*pi*r; printf("Perimeter=%f",p); } Output   Print   Download Code Output Enter the value of radius: 9 Perimeter=56.520000

#include<stdio.h> #define pi 3.14 void main() { int r; r=7; printf("Perimeter=%f",2*pi*r); } Output   Print   Download Code Output Perimeter=43.960000

#include<stdio.h> #define PI 3.142 void main() { float r,a,c; printf("\nEnter the radius of circle:\t"); scanf("%f",&r); a=PI*r*r; printf("\nThe area of the circle:\t%f",a); c=2*PI*r; printf("\nThe circumference of the circle: %f",c); } Output   Print   Download Code Output Enter the radius of circle: 2 The area of the circle: 12.568000 The circumference of the circle: 12.568000 Enter the radius of circle: 1 The area of the circle: 3.142000 The circumference of the circle: 6.284000