1.	All right angles are ____________.
		A.	congruent	B.	complementary
		C.	transitive	D.	180°
		Hint
	2.	If and form a linear pair and find
		A.	106	B.	76
		C.	96	D.	86
		Hint
	3.	If and are vertical angles and and find
		A.	72	B.	23
		C.	43	D.	68
		Hint
	4.	Two angles are congruent if they are ______.
		A.	adjacent	B.	a linear pair
		C.	supplementary	D.	vertical
		Hint
	5.	In the picture, and are vertical. If then what is
		A.	90	B.	162
		C.	81	D.	28
		Hint