The Rectangle has two data members upperLeft and lowerRight points, that represents upper left and lower right coordinates, respectively. Therefore a rectangle can be represented by a nested structure...

The Rectangle has two data members upperLeft and lowerRight points, that represents upper left and lower right coordinates, respectively. Therefore a rectangle can be represented by a nested structure having two structures of the type POINTS as defined below.



typedef struct{
Point upperLeft;
Point lowerRight;
}Rectangle;

implement the following functions:
a. float length (Rectangle rec);  //returns the length of the rectangle
b. float width (Rectangle rec); //returns the width of the rectangle
c. float area (Rectangle rec); //returns the area of the rectangle
d. float perimeter(Rectangle rec); //returns the area of the rectangle