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algebra

The sum of the angles of a triangle is 180 degrees. If one angle measures x degrees, a second angle measures 3x degrees, and a third angle measures 7x degrees, express the measure of the fourth angle in terms of x.

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  1. Fourth angle in a TRIangle?

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    Ms. Sue
  2. Sorry, express the measure the third angle in terms of x**

    I don't know why I typed "fourth".

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  3. x + 3x + 7x = 180
    11x = 180
    x = 16.3636

    7 * 16.3636 = about 114.545 degrees

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    Ms. Sue

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