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Mathematics 9 Online
OpenStudy (anonymous):

In a two colum proof, Prove: If a line is perpendicular to each of two other lines, all in one plane, then the two other lines are parallel. Given: t is perpendicular to r, t is perpendicular to s. Prove: r is parallel to s

Directrix (directrix):

@BVBarmy666 I think I can help you with this. Please post the diagram. If there is not one, let me know. Thanks.

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