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in a triangle one angle is twice of other and their sum is the third angle .the angles are

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  1. smallest angle --- x
    one of the others --- 2x
    third angle = x+2x = 3x

    thus:
    x + 2x + 3x = 180

    carry on

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    posted by Reiny
  2. assuming you're working in degrees . . .

    the three angles sum to 180 degrees

    A = 2B
    A + B = C
    A + B + C = 180

    then substitute

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