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10-66.

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  1. ?

    How do the end points of and relate?

  1. ?

    Notice . If A is the center, then what is true about the lines and , and consequently and ?

    What is true about the sum of and ?

  1. ?

    See hint from part (a).

  1. ?

    If A is the center, then the line must be the circle's diameter.

    What does that mean for the the arc or semi-circle?

  1. ?

    See hints for part (b).

  1. ?

    Use the answer from part (e) and hints from part (b).

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