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d2=12 cm
sisi miring =
t = 20cm
L prisma = (2x Lalas) + (jumlah luas sisi)
= (2x1/2.d1.d2) + (4x p.l )
= (16.12) + (4x 20 x 10 )
=(192)cm² + ( 800)cm²
= 992 cm²