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BAB : SEGITIGA
jawab:
<A+<B+<C = 180°
45+2x-5+3x= 180
40 + 5x = 180
5x = 180-40
5x = 140
x = 140/5
x = 28
sudut B
=> 2x - 5
=> 2(28)-5
=> 56-5
=> 51°
semoga membantu:)