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60 + 30 + z = 180°
z= 90°
3x + z = 150°
3x + 90 = 150°
3x = 60°
x = 20°
3x + z + 2y = 180°
3(20) + 90 + 2y = 180°
60 + 90 + 2y = 180°
2y= 30°
y= 15°
jadi, x + y + z = 20 + 15 + 90 = 125° (A)
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