luas gabungan tersebut 16 cm

luas = 15x12/2 + (8+12)x6/2 = 90 + 60 = 150 cm^2

Luas trapesium = (8+12) x 6/2 = 60 cm²
Luas segitiga = 15 x 12/2 = 90 cm²
= 90 + 60 = b. 150 cm²

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