Lab1 Calculate Circumference and Area

void setup(){
size(300,100);
float circumference;
float diameter;
float radius;
float area;
//----- Define value -----//
diameter = 30;
radius = diameter/2;
//----- Formula of circumferencecumference -----//
circumference = PI*2*radius;
println("circumferencecumference = "+circumference);
//----- Formula of circumferencecle area -----//
area = PI*radius*radius;
println("area of circumferencecle = "+area);

fill(0);
textSize(12);
text("Diametermeter = "+diameter+" cm",0,10);
text("Radius = "+radius+" cm",0,30);
text("Circumferencecumference = "+circumference+" cm",0,50);
text("Area of circumferencecle = "+area+" cm2",0,70);

}