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96 = 4s
s = 24 cm
Luas Alas = s² = 24² = 576 cm²
L.Δ = 1/2.a.t
= 1/2.24.20
= 12.20
L.Δ = 240 cm²
Lp = L.alas + L.Selubung
= 576 cm² + 4 * 240 cm²
= 576 cm² + 960 cm²
Lp = 1536 cm²