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12 x = 180 - 120°
12 x = 60°
x = 60°/12
x = 5°
56° + 5x + 2y = 180° (krn saling berpelurus)
56° + 5 .(5) + 2y = 180°
56° + 25° + 2y = 180°
81° + 2y = 180°
2y = 180° - 81°
2y = 99°
y = 99°/2
y = 49,5°
12.x + 56° + 4z = 180 (jumlah sudut sudut dalam pada Δ = 180°
12(5) + 56 + 4z = 180°
60° + 56° + 4z = 180°
116° + 4z = 180°
4z = 180 - 116°
4z = 64°
z = 64°/4
z = 16°
x° + y° + z° = 5° + 49,5° + 16°
= 70,5°