float pi = 3.14;
int delayTime = 1000;
String myString = "A circle with radius ";
int r = 1;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.print(myString);
  Serial.print(r);
  Serial.print(" units");
  Serial.print(" has an area : ");
  Serial.print(pi*r*r);
  Serial.print(" units^2");
  delay(delayTime);
  r = r+1;
  Serial.println();
}