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construct-angle-f-so-that-m-angle-f-equals-2-m-angle-c

  • math -

    Given angle c, ACB

    construct a circle with center C intersecting AC at D and CB at E.

    Using D as a center, construct a circle with radius DE so it intersects the circle C at F.

    Angle FCA = ACB since they subtend equal arcs.

    So, FCB = FCA+ACB = 2*ACB

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