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La = 8 . 15 /2
La = 60 cm²
Ka = jumlah semua sisi
Ka= 8 + 15 + 17
Ka = 40 cm
Lp = 2La + Ka . t
Lp = 2 . 60 + 40 . 24
Lp = 120 + 960
Lp = 1080 cm²