2a = 54
a = 54/2
a = 27°
3b + 54 = 180
3b = 180 - 54
3b = 126
b = 126/3
b = 42°
Jadi, jawabannya adalah B.
Semoga membantu ^^
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2a = 54
a = 54/2
a = 27°
3b + 54 = 180
3b = 180 - 54
3b = 126
b = 126/3
b = 42°
Jadi, jawabannya adalah B.
Semoga membantu ^^