Tolong secepatnya ;) plis
Jawaban:
B. 66°
Penjelasan dengan langkah-langkah:
108° + 12x = 180
12x = 180 - 108
12x = 72
x = 72/12
x = 6°
56 + (5x + 2y) = 180
56 + 5(6) + 2y = 180
2y = 180 - 56 - 30
2y = 94
y = 94/2
y = 47°
12x + 56 + 4z = 180
12(6) + 56 + 4z = 180
4z = 180 - 72 - 56
4z = 52
z = 52/4
z = 13°
x + y + z = 6 + 47 + 13 = 66°
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