#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;
}
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