Tolong bantu secepatnya ya, lagi bantuin periksa soal

Tinggi ∆
= √(5cm)²-(3cm)²
= √25cm²-9cm²
= √16cm²
= 4cm

Lebar bangun ruang
= vol ÷ luas ∆
= 72cm³ ÷ (½ × 3cm × 4cm)
= 72cm³ ÷ 6cm²
= 12cm {D}

Semoga bermanfaat ^_^
Selamat belajar!!!