volume bangun diatas adalah...

Vprisma
=Lalas × t
=½ × a × t ×tprisma
=½ × 20 × 20 × 15
=200×15
=3000

Vbalok
=p×l×t
=50 × 20 × 20
=20000
V bangun ruang
=3000+ 20000
=23000