Lab 2 Calculation of Cricle

void setup()
{
  float area = calculation_area(15); // เส้นรอบวง
  float circumference  = calculation_circumference(15);     // พื้นที่
  float diameter = calculation_diameter(15);     // เส้นผ่านศูนย์กลาง
  println("area="+area);
  println("circumference="+circumference);
  println("diameter="+diameter);
}
float calculation_area(float raidus){
  float area;
  area = PI*(raidus*raidus);
  return area;
}
float calculation_circumference(float raidus){
  float circumference;
  circumference = 2*PI*raidus;
  return circumference;
}
float calculation_diameter(float raidus){
  float diameter;
  diameter = 2*raidus;
  return diameter;
}