1.	All right angles are ____________.
		A.	complementary	B.	congruent
		C.	transitive	D.	180°
		Hint
	2.	If and form a linear pair and find
		A.	86	B.	96
		C.	76	D.	106
		Hint
	3.	Which statement explains why
		A.	If two angles form a linear pair, then they are supplementary.
		B.	All right angles are congruent.
		C.	Angles supplementary to the same angle are congruent.
		D.	If the sum of the measures of two angles is 180, then they are supplementary.
		Hint
	4.	Two angles are congruent if they are ______.
		A.	vertical	B.	supplementary
		C.	a linear pair	D.	adjacent
		Hint
	5.	In the picture, and are vertical. If then what is
		A.	28	B.	90
		C.	162	D.	81
		Hint