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a = 1/2 x 12
= 6
b = 1/2 x 16
= 8
s = √8² + 6²
= √64 + 36
= √ 100
= 10
luas prisma
luas = ( d1 x d2) + ( 4 x s x t)
= ( 12 x 16) + ( 4 x 10 x 25)
= 192 + 1000
= 1192 cm²