Lab 1 : Calculate circumference and area of a circle

void setup(){
size(500,200);

int r;
float Area;
float Circumference;

//////////calculate area of a circle//////////

r=10;
Area=PI*r*r;

//////////calculate circumference of a circle//////////

Circumference=TWO_PI*r;

textSize(20);
fill(0);
text("Radius = "+r+" cm.",20,50);
text("Value of Circumference = "+Circumference+" cm.",20,90);
text("Value of Area = "+Area+" cm*cm",20,130);

}