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| conditional (if then) statements |
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| "if" part of conditional statement |
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| "then" part of conditional statement |
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| if x then y becomes if y then x |
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| example used to prove the if-then statement false. has a true hypothesis and false conclusion |
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| statement containing the words "if and only if" |
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| add up to equal 180 degrees |
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| two angles whose sides form two pairs of opposite rays |
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| two lines that intersect to form right angles |
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