Area = function (circle)
{
    return (circle.radius > 0) ? Math.PI * circle.radius * circle.radius : 0;
}
Calculates the area of the circle.

@function Phaser.Geom.Circle.Area
@since 3.0.0

@param {Phaser.Geom.Circle} circle - The Circle to get the area of.

@return {number} The area of the Circle.