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OpenStudy (anonymous):
ddddddddddd
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OpenStudy (anonymous):
grad of line PQ = ((-12) - (-10)) / ((-5) - (-8)) => -2/3 grad of line RS = ((-5) - (-6)) / (17 - 9) => 1/8 gradient of line that is perpendicular is negative reciprocal of original line. 3/2 doesn't equal 1/8 so the lines PQ and RS are not perpendicular
OpenStudy (anonymous):
negative reciprocal of original line's gradient*
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