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pnjang kwat sluruhnya
30x4x3=360
17x4x3=204
8x4x3=96
360+204+96=660
sisanya 800-660=140cm
kerangka balok
(30x4)+(17×4)+(8×4) = 220 cm
220 x 3 buah = 660 cm
800-660 = 140 cm atau 1,4 m