Find Perimeter of a Circle. Take the value of the radius from user. Sumit Kar July 27, 2015 Basic, Input, Macro No comments #include<stdio.h>#define pi 3.14void 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 OutputEnter the value of radius: 9Perimeter=56.520000 Read More Share This: Facebook Twitter Google+ Stumble Digg WhatsApp