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OpenStudy (anonymous):
is this a perpendicular reversible? "two lines that intersect at right angles are perpendicular" 1. the statement is not rebversible 2.yes; if two lines intersect at right angles, then they are perpendicular 3.yes; if two lines are perpendicular, then they intersect at right angles 4.yes; two lines intersect at right angles if (if and only) they are perpendicular
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