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23 March, 15:51

2) The measure of one angle of a triangle is twice the measure of another. The measure of

the third angle exceeds four times the measure of the smaller by 12 degrees. Find the

measure of each angle.

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Answers (1)
  1. 23 March, 17:28
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    let A, B, C be angles of the triangle

    A = 2B; so B = A/2

    Therefore B is the smallest angle, so C = 4B + 12 = 2A + 12

    now, A + B + C = 180, by angle sum property of a triangle

    since we know that B = A/2 and C = 2A+12, lets substitute both of them in that equation.

    A + A/2 + 2A + 12 = 180

    (2A+A+4A+24) / 2 = 180

    7A + 24 = 180 * 2

    A = (360-24) / 7 = 48

    Thus, B = A/2 = 48/2 = 24 and C = 4 (24) + 12 = 108.
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