Problem:

 

Plot the following coordinates: A (2,3) B (3,3) C (3,1).

Determine the coordinates of D so that

 

1.   ABCD is a rectangle

2.   ABCD is a trapezoid

 

 

 

 

Answer:
 

1.   The coordinates of D are (2,1).

            

2.   The coordinates of D could be (2,2), (2,0) or (1,1).