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=(28+42)x18:2
=70x18:2
= 630 cm2
Lsegitiga=BFXAO:2
=28x18:2
=252 cm2
Lseluruh=Ltrapesium+Lsegitiga
=630+252
=882 cm2
Jadi jawabannya B
maaf kalo kurang jelas&kurang sempurna..
Luas Segitiga = 28 X 18 : 2 = 252 cm2
Luas Trapesium + Luas Segitiga = 630 + 252 cm2 = 882 cm2