/*
  contract: circ_area: double -> double
  purpose: return the area of a circle
           whose radius is <radius>
  examples: circ_area(1) == 3.14159;
            circ_area(10) == 314.159;

  last modified: 4-17-07
*/

// including circ_area.h ONLY because of PI declaration there
//    (including so that callers of this can also use that
//    PI if they wish)

#include "circ_area.h"
using namespace std;

double circ_area(double radius)
{
    return PI * (radius * radius);
}