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Mathematics 7 Online
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 ?

OpenStudy (anonymous):

@Vocaloid can you help?

OpenStudy (anonymous):

OpenStudy (anonymous):

@robtobey ?

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