1.	All right angles are ____________.
		A.	180°	B.	complementary
		C.	transitive	D.	congruent
		Hint
	2.	If and form a linear pair and find
		A.	76	B.	86
		C.	96	D.	106
		Hint
	3.	Which statement explains why
		A.	All right angles are congruent.
		B.	Angles complementary to the same angle or to congruent angles are congruent.
		C.	Vertical angles are congruent.
		D.	Angles adjacent to the same angle or to congruent angles are congruent.
		Hint
	4.	Two angles are congruent if they are ______.
		A.	vertical	B.	supplementary
		C.	a linear pair	D.	adjacent
		Hint
	5.	If and form a linear pair and m = 72, find m.
		A.	144	B.	72
		C.	108	D.	18
		Hint