#include <circleArea.h>
void setup() {
  // put your setup code here, to run once:
    Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:

    for (int i=1; i<5; ++i ) {
        Serial.print("circle area with radius ");
        Serial.print(i);
        Serial.print(" = ");
        Serial.println(circleArea(i));
    }
}