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= 8² - 4²
= 64 - 16
= 48
tΔ = √48
= √16 .√3
= 4√3
L.alas = 1/2 x a x t
= 1/2 x 8 x 4√3
= 16√3 cm²
keliling alas = 3 x s
= 3 x 8
= 24 cm
L.permukaan = 2 .L.alas + kll.alas x t.prisma
= 2 .16√3 + 24 x 15
= 32√3 + 360 cm²