Inverse - If two lines are not perpendicular, then they do not form right angles., Converse - If two lines form right angles, then they are perpendicular., Contrapositive - If two lines do not form right angles, then they are not perpendicular., If - Then - If two lines are perpendicular, then they form right angles., Biconditional - Two lines are perpendicular if and only if they form right angles.,

CONVERSE, INVERSE AND CONTRAPOSITIVE

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