Lab 2 : Function Circle

 
void setup() {
  size(300, 200);
  background(#74A3FF);
  float r=10;
  float circumference=cal_circumference(r);
  float area=cal_area(r);

  textAlign(LEFT);                  //text
  textSize(20);
  fill(#ffffff);
  text("Radius = "+r, 150, 50);
  text("Circumference = "+circumference, 150, 100);
  text("Area = "+area, 150, 150);
}

float cal_circumference(float r) {
  float circumference=PI*r*2;
  return circumference;
}

float cal_area(float r) {
  float area=PI*r*r;
  return area;
}