1.	The quadrilateral below is a parallelogram because_______.
		A.	the diagonals are perpendicular	B.	it is a square
		C.	the diagonals bisect each other	D.	the diagonals are not congruent
		Hint
	2.	Find the values of x and y that ensure that the quadrilateral is a parallelogram.
		A.	x = 13, y = 12	B.	x = 12, y = 13
		C.	x = 16, y = 26	D.	x = 16, y = 12
		Hint
	3.	Which are the coordinates of the vertices of a parallelogram?
		A.	(0, 0), (1, 2), (6, 2), (4, 0)
		B.	(-3, 2), (-1, 3), (2, 2), (0, 1)
		C.	(-2, 1), (-3, 2), (-4, 3), (1, 1)
		D.	(4, 1), (3, 5), (0, -2), (3, 3)
		Hint
	4.	Find the values of x. and y that ensure that LMNO is a parallelogram.
		A.	x = , y =	B.	x = , y = 4
		C.	x = 8, y = 1	D.	x = 4, y =
		Hint
	5.	The coordinates of the vertices of the quadrilateral ABCD are A(-1, 1), B(5, 1), C(1, -1), and D(-5, -1). Is ABCD a quadrilateral? Explain.
		A.	Yes. and .
		B.	Yes. and .
		C.	No. is not parallel to .
		D.	No. is not congruent to .
		Hint