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