volume bangun berikut adalah....cm3

20x10x12=2400cm2    21-12= 9  9x10x10=900cm   2400cm+900cm=3300cm2

v balok besar
= p x l x t
= 20 x 10 x 12
= 200 x 12
= 2.400 cm^3

v balok kecil
= p x l x t
= 10 x 10 x (21 - 12)
= 100 x 9
= 900 cm^3

v gabungan
= 2.400 + 900
= 3.300 cm^3