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A Paste by Anonymous
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// Pre:  Takes a positive radius for a circle
// Post: Returns area of the circle
double area( double r );
// Pre:  Takes a positive length and width of a rect
// Post: Returns area of the rect
double area( double x, double y );
// Pre:  Takes 3 positive lengths that form a triangle
// Post: Returns area of the triangle
double area( double a, double b, double c );