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25 April, 00:59

Two angles of a triangle have equal measures, but the third angle's measure is 36° less than the sum of the other two. Find the measure of each angle of the triangle.

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  1. 25 April, 01:55
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    Draw a triangle and label is ABC.

    Let angle A = x

    let angle B = x

    let angle C = 2x - 36

    2x - 36 means that angle C is 36 degrees less than the sum of angle A and B.

    Since the sum of the interior angles of a triangle is 180 degrees, then 2x + 2x - 36 = 180.

    combine like terms in that equation and you get 4x - 36 = 180

    add 36 to both sides of that equation and you get 4x = 216

    divide both sides of that equation by 4 and you get x = 54 degrees

    angle A = 54 degrees

    angle B = 54 degrees

    angle C = 108 - 36 = 72 degrees

    54 + 54 + 72 = 108 + 72 = 180 degrees so the angles are good because they add up to 180 degrees and the third angle is 36 degrees less than the sum of the other 2.
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