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1/2.24 = 12 cm
maka :
sisi alas = akar dr 9²+12²
= akar dr 81+144
= √225
= 15 cm
b) L sisi prisma = 2.L alas + K alas.t
= 2.1/2.d1.d2 + 4.s.t
= 2.1/2.18.24 + 4.15.10
= 432 + 600
= 1032 cm²