Lab 1 (circle calculation)

void setup() {
  size(500, 500);
  background(105,211,162);
}
void draw() {
  float diameter=30;
  float area;
  float circumference;
  //calculate
  area=PI*(diameter/2)*(diameter/2);
  circumference=(2*PI)*(diameter/2);
  //show
  fill(0,0,0);
  textSize(25);
  text("Diameter="+diameter, 150, 100);
  textSize(20);
  text("circumference = "+circumference, 10, 150);
  textSize(20);
  text("area = "+area, 10, 200);

 }