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Verified answer
L.alas= 1/2 x a x t
= 1/2 x 9 x 12
= 54 cm
keliling alas
= s + s + s
= 9+12+15
= 36 cm
maka,
Lp.prisma
= (2xLa)+(Ka x t)
= (2x54)+(36x8)
= 108+288
= 396 cm²