I need program c++ culclet a area for cicale

Question

thank

Answer 1

define PI as e.g 3.14, then just make simple calculations, I can't see any diffuculties.

Answer 2

const decimal pi = 3.14;
Console.WriteLine(calculate(6));
public double calculate(double radius){
decimal r2 = Math.Pow(radius,2);
return pi*r2;}

C#

Answer 3

احلى عبوووود ههه