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1/3 x Luas alas x t
1/3 x (15x15) x (30-15)
1/3 x 225 x 15
1/1 x 225 x 5
= 1.125
Kubus =
15 x 15 x 15
225 x 15
= 3.375
Gabungan =
1.125 + 3.375
= 4.500 cm3 [D]