1.	Which statement explains why
		A.	Angles adjacent to the same angle or to congruent angles are congruent.
		B.	Vertical angles are congruent.
		C.	Angles complementary to the same angle or to congruent angles are congruent.
		D.	All right angles are congruent.
		Hint
	2.	In the figure shown, is complementary to and is complementary to . Which statement is true if none of the measures of the angles equal 45?
		A.		B.	is complementary to .
		C.		D.	is complementary to itself.
		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.	supplementary	B.	vertical
		C.	adjacent	D.	a linear pair
		Hint
	5.	In the picture, and are vertical. If then what is
		A.	90	B.	162
		C.	28	D.	81
		Hint