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Sudut x:

12x + 108 = 180

12x = 180 – 108

12x = 72

x = 72/12

x = 6°

Sudut y:

5x + 2y + 56 = 180

5(6) + 2y + 56 = 180

30 + 2y + 56 = 180

2y + 86 = 180

2y = 180 – 86

2y = 94

y = 94/2

y = 47°

Sudut z:

12x + 56 + 4z = 180

12(6) + 56 + 4z = 180

72 + 56 + 4z = 180

128 + 4z = 180

4z = 180 – 128

4z = 52

z = 52/4

z = 13°