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21 April, 03:08

Write a paragraph proof of this theorem: In a plane, if two lines are perpendicular to the same line, then they are parallel to each other.

Given: R ] S, T ] S

Prove: R II T

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  1. 21 April, 03:31
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    If you call the gradient of S m:

    Gradient of R if perpendicular to S = - 1/m

    Gradient of T if perpendicular to S = - 1/m

    -1/m=-1/m, so the lines are parallel
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