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480 Cm³ = ( S² / 4 ) √3 × 10√3
480 Cm³ = S² . 30/4
S² = 480 × 4/30
S² = 64
S = √64
S = 8
Keliling Alas = 3 × S
= 3 × 8
= 24 Cm
L.Selubung = Keliling Alas × Tinggi Prisma
= 24 × 10√3
= 240√3