9-2: Lesson Quiz Which is a plan to show that line m and line n are perpendicular?
A. Find the lengths of m and n, and show that length m = length n.
B. Find the slopes of m and n, and show that slope m = -1 x slope n.
C. Find the slopes of m and n, and show that slope m = -1 = slope n.
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D. Find the lengths of m and n, and show that length m = -1 = length n.