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Math Help - Need help for geometry proof

  1. #1
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    Question Need help for geometry proof

    I need to write a proof and prove that: any triangle inscribed in a semicircle is a right triangle.

    I realize that it is right, but I am unsure how to prove that it is true.

    Can anyone help me with an idea of where to start?

    Thanks.
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  2. #2
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    Realize that the diameter of the circle is the hypotenuse of the triangle.
    Any inscribed angle in a circle measures one-half the intercepted arc.
    But that is the “other” semicircle which measures \pi.
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  3. #3
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    I'm confused with what the intercepted arc is and therefore both the second and third lines confuse me.
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