Geometryeasy · Past Paper
Two lines with slopes m1 and m2 are perpendicular if:
Am1 = m2
Bm1 * m2 = 1
Cm1 * m2 = -1
Dm1 + m2 = 0
✓ Correct Answer: C — m1 * m2 = -1
The product of the slopes of two perpendicular lines is -1.
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