1.	All right angles are ____________.
		A.	complementary	B.	transitive
		C.	180°	D.	congruent
		Hint
	2.	Which statement explains why
		A.	Angles complementary to the same angle or to congruent angles are congruent.
		B.	Angles adjacent to the same angle or to congruent angles are congruent.
		C.	Vertical angles are congruent.
		D.	All right angles are congruent.
		Hint
	3.	If and are vertical angles and and find
		A.	23	B.	72
		C.	68	D.	43
		Hint
	4.	Two angles are congruent if they are ______.
		A.	vertical	B.	a linear pair
		C.	adjacent	D.	supplementary
		Hint
	5.	In the picture, and are vertical. If then what is
		A.	162	B.	28
		C.	90	D.	81
		Hint