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4 s =40 = √ 100 - 36
s = 40 ÷ 4 = √64
s = 10 Diagoanal 2 = 8
Luas Prisma = 2 Luas alas + Keliling alas × t prsma
= 2 ( 1/2 x d1 x d2 ) + ( 4 x s ) × t prsma
= 2 ( 1/2 × 12 × 8 ) + ( 4 × 10 ) × 18
= 96 + 720
= 816 cm²