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A point O is taken inside an equilateral...

A point `O` is taken inside an equilateral four sided figure `A B C D` such that its distances from the angular points `D` and `B` are equal. Show that `A O` and `O C` are in one and the same straight line. GIVEN : A point `O` inside an equilateral quadrilateral four sided figure `A B C D` such that `B O=O Ddot` TO PROVE : `A O` and `O C` are in one and the same straight line.

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