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Lp = 2 (pl + Pt + Lt)
1.300 = 2 (pl + Pt + Lt)
650 = pl + Pt + Lt
650 = 4a3a + 4a2a + 3a2a...>(misal a pembanding)
650 = 12a² + 8a² + 6a²
26a² = 650
a² = 25
a = 5
P = 4 x5 = 20
L = 3 x 5 = 15
T= 2 x 5 = 10
ukuran balok = 20x15x10