%circleArea(number) -> number
%Authors: James Atlas
%CISC106 Lab Section 45 TA: Scott Ivanka 
%Description:
%    This function computes the area of a circle given the radius.
%Examples:
%    circleArea(3) -> 28
%    circleArea(5) -> 78 
%    circleArea(45) -> 6362
function output = circleArea(radius)
  output = pi * radius * radius;