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12x = 180 - 108
12x = 72
x = 6
56 + 5x + 2y = 180 (saling berpelurus)
56 + 5 (6) + 2y = 180
56 + 30 + 2y = 180
2y = 180 - 56 - 30
2y = 94
y = 47
12x + 56 + 4z = 180 (jumlah sudut dlm segitiga 180)
12 (6) + 56 + 4z = 180
72 + 56 + 4z = 180
4z = 180 - 72 - 56
4z = 52
z = 13
maka
x + y + z = 6 + 47 + 13
= 66
semoga membantu ya :)
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