square, rectangle, an triangle

I would like someone , if they have the time and patience to help me out with a a very basic and simple program. I need help constructing a square, a rectangle and a triangle of any size. If someone could possibly teach me, I would greatly appreciate it. Thank you.

Code:

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typedef struct
{
  int X;
  int Y;
}POSITION;

typedef struct
{
  int Width;
  int Height;
}DIMENSION;

typedef struct
{
  POSITION Position;
  int WidthAndHeight;
}SQUARE;

typedef struct
{
  POSITION Position;
  DIMENSION Dimension;
}RECTANGLE;

typedef struct
{
  POSITION Corner1;
  POSITION Corner2;
  POSITION Corner3;
}TRIANGLE;

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Heres one way.