method named area with one double parameter named radius

The method needs to return a double value that represents the area of a circle

If the parameter radius is negative then return -1.0 represent an invalid value

overloaded method method with 2 parameters x and y (both double). where x and y represent the sides of rectangles

The method needs to return an area of rectangle

if either or both parameters is/are a negative return -1.0 indicate an invalid value

for formulas and Pi value

Examples

area(5.0); should return 78.53975

area(-1); should return -1 since the parameter is negative

area(5.0,4.0); should return 20.0 (5*4-20)

area(-1.0,4.0); should return -1 since the first the parameter is negative