Two angles are supplementary. The measure of the larger angle is twice the measure of the smaller angle. Find the measure of the angles. Supplementary angles add up to 180° x = one angle 180  x = other angle {the two angles add up to 180°} 180  x = 2x {the measure of the larger is twice the measure of the smaller} 180 = 3x {added x to both sides} x = 60 {divided both sides by 3} 180  x = 120 {substituted 60, in for x, into 180  x} the two angles are 60° and 120° © Algebra House
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