Construct a geometric proof using Figure 15 that shows two lines are perpendicular if and only if

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Construct a geometric proof using Figure 15 that shows two lines are perpendicular if and only if their slopes are negative reciprocals of one another.
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Calculus

ISBN: 978-0131429246

9th edition

Authors: Dale Varberg, Edwin J. Purcell, Steven E. Rigdon

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