#include float pi = 3.14159; float radius = 50; float area; void setup() { Serial.begin(9600); Serial.println("Arduino Area Calculator:"); Serial.print("n"); Serial.print("Radius = "); Serial.print(radius); Serial.print("n"); area = pi*sq(radius); Serial.print("The Area of circle is: "); Serial.println(area); } void loop() { // we need this to be here even though it is empty }