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= 3 x 5
= 15 cm
karena prisma, berarti alasnya ada dua jadi dikali 2
= 15 x 2 = 30 cm
tinggi prisma = 20 cm
= 20 x 3 = 60 cm
dijumlahkan 60 + 30= 90 cm (d)
24). 60/100 x 20/100 = 1200/100 = 12 persen (c)