tolong dijawab????.........

20 cm × 15 cm = 300 cm²
12 cm × 15 cm = 180 cm²
12 cm + 20 cm = 32 cm/2 = 16 cm × 15 = 240 cm ² × 2 = 480 cm²
15 cm × 15 = 225 cm ²
15cm × 17 cm = 255 cm ²
jumlah = 1340 cm² ( B )