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=10 x10 x4 = 400 cm3
lp = luas alas + 4 luas segitiga
lp = 10 x10 + 4 x 10 x t /2
lp = 100 + 20 x t
t sgitiga harus dicari dengan pitagoras
t =akar 5`2 + 12`2 =akar 25 + 144 = 13
lp =100 + 20 x 13 = 100 + 260 = 320 cm2