maaf tolong bantu jwb ya... terimkasih sblmnya

L1 = ½ × a × t
= ½ × (20 - 2 - 2) × 6
= ½ × 16 × 6
= 48 dm²

L2 = p × l
= (20 - 2 - 2) × 15
= 16 × 15
= 240 dm²

L3 = p × l
= 20 × 3
= 60 dm²

Luas total
= L1 + L2 + L3
= 48 + 240 + 60
= 348 dm²
= 34.800 cm²

L1 = ½ × a × t
= ½ × (20 - 2 - 2) × 6
= ½ × 16 × 6
= 48 dm²

L2 = p × l
= (20 - 2 - 2) × 15
= 16 × 15
= 240 dm²

L3 = p × l
= 20 × 3
= 60 dm²

Luas semua bangun
= L1 + L2 + L3
= 48 + 240 + 60
= 348 dm²
= 34.800 cm²

Semoga membantu :))