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OpenStudy (anonymous):
If A(x1, y1), B(x2, y2), C(x3, y3), and D(x4, y4) form two line segments, AB and CD , which of these conditions needs to be met to prove that AB is perpendicular to CD ?
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OpenStudy (anonymous):
@Vocaloid can you help?
OpenStudy (anonymous):
OpenStudy (anonymous):
@robtobey ?
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