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Area of circle

Calculates the area of a circle #include <stdio.h> #define PI 3.14159 int main() { float sum , radius ; printf("This program works out the area of a circle.\n"); printf("Enter the radius of the circle.\n"); scanf("%f",&radius); /*area of a circle is pi * radius * radius*/ sum = PI * radius * radius; /*display the area*/ printf("The area of a circle is %f.\n",sum); return 0; }