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320 = p . 16
p = 20 cm
2560 = 20 x 16 x t
2560 = 320 x t
t = 8 cm
L balok = 2 (pl + pt + lt)
= 2 (20.16 + 20.8 + 16.8)
= 2 ( 608)
= 1216 cm²
320 cm² = p x 16cm
320 cm²/16 cm = p
20 = p
v. balok = p x l x t
2560 cm³ = 20cm x 16cm x t
2560 cm³ = 320cm² t
2560 cm³/320cm² = t
8 cm = t
L.permukaan balok = 2(pl+pt+lt)
=2(20.16 + 20.8 + 16.8)
=2(320 + 160 + 128)
=2(608)
=1216 cm