Suppose two circles intersect at A and B. Let C and D be points А on one of the circles, let C'A intersect the other circle again at E, and let DB intersect the other circle again at F. Prove EF is parallel to C'D. D B

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A: Since opposite sides of a parallelogram are equal, therefore

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Q: In a plane, l lm and t 1 m. l and t related? By appearance, how are

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A: I have provided a solution in step2.

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