1.	Which problem-solving strategy is used in indirect proofs?
		A.	working backward	B.	guess and check
		C.	draw a diagram	D.	decision-making
		Hint
	2.	State the assumption that could be used to start an indirect proof of the statement Points A, B, C, and O are coplanar.
		A.	Points A, B, C, and O are collinear.	B.	Points A, B, C, and O are not coplanar.
		C.	Points A, B, C, and O form a quadrilateral.	D.	Points A, B, C, and O are coplanar.
		Hint
	3.	What is another name for an indirect proof?
		A.	proof by contradiction	B.	proof by assumption
		C.	default proof	D.	paragraph proof
		Hint
	4.	Which assumption would you make to start an indirect proof of the following statement? The majority of students surveyed preferred chocolate ice cream to vanilla ice cream.
		A.	The number of students surveyed that preferred chocolate ice cream to vanilla ice cream was greater than 50%.
		B.	The number of students surveyed that preferred chocolate ice cream to vanilla ice cream was greater than 25%.
		C.	The number of students surveyed that preferred vanilla ice cream to chocolate ice cream was greater than 25%.
		D.	The number of students surveyed that preferred vanilla ice cream to chocolate ice cream was greater than 50%.
		Hint
	5.	The type of reasoning that uses a number of examples to arrive at a conclusion is __________ .
		A.	contradictory reasoning	B.	deductive reasoning
		C.	inductive reasoning	D.	exemplary reasoning
		Hint