19 terms

geometry ch. 2

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conditionals
if-then statements
hypothesis
follows the "if" in conditionals, an educated guess
conclusion
follows the "then" in conditionals
converse
formed by interchanging the hypothesis and the conclusion, aren't always true
counterexample
an example that implies that the converse is false
inverse
when not is added in a conditional and is true
contrapositive
when not is added to a converse and is true,
contrapositive, converse
the conditional = the ________________ and the inverse = the ___________
biconditional
a statement that contains the words "if and only if"
substitution
the property that substitutes
reflexive
the property that reflects what is true
symmetric
the property that switches the things on opp. sides of the =
transitive
property that says if blank = blank and blank = blank, then blank 1 = blank 2
complementary angles
angles that add up to 90 degrees
supplementary angles
angles that add up to 180 degrees
vertical angles
non adjacent angles from when 2 lines intersect
perpendicular lines
lines that intersect to form right angles or 90 degree angles
statement, converse
in order for a definition to be true, the ____________ & ___________ is true
deductive reasoning
proofs - proved statements