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sudut q = 2x
sudut r = 3x - 15
50 derajat + sudut q + sudut r = 180 derajat
50 + 2x + 3x - 15 = 180
35 + 5x = 180
35 + 5x - 35 = 180 - 35
5x = 145
x = 29
sudut q = 2x
= 2 x 29 = 58 derajat
sudut r = 3 x 29 - 15
= 87 - 15 = 72 derajat
50 derajat + 58 derajat + 72 derajat = 180 derajat