write a program to find the area and circumference of semi-circle.

#include<stdio.h>
main()
{
float rad,area,peri;
printf("enter the radius of semi-circle:");
scanf("%f",&rad);
area=(3.14*rad*rad)/2;
peri=3.14*rad;
printf("area of semi-circle=%f\n:",area);
printf("circumference of a semi-circle=%f:\n",peri);
}