You couldn't type the question for us?
Did you make a sketch?Quadrilateral has vertices with coordinates:
Determine the coordinates of for which is a square.Code:| (1,4) | o C | * * * * * | * B * | * D - - o - - | - - - - - - o - - (-3,0)* | * * | * * * | * * | o A | (1,-4)
You can "eyeball" where is . . . can't you?