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L1 = p × l = 12 × 4 = 48 cm
L2 = 1/2 × a × t = 1/2 × 4 × 4 = 16/2 = 8 cm
karna ada 2 buah segitiga maka 8 × 2 = 16
L3 = s × s = 12 × 12 = 144 cm
L Gabungan = 48 + 16 + 144 = 208 cm