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l = 1,2 m
LP = 2(p × l) + 2(p × t) + 2(l × t)
13,12 = 2(p × 1,2) + 2(p × 2) + 2(1,2 × 2)
6,56 = (p × 1,2) + (p × 2) + (1,2 × 2)
6,56 = 1,2p + 2p + 2,4
6,56 = 3,2p + 2,4
3,2p = 3,56 - 2,4
3,2p = 4,16
p = 1,3
Jadi panjangnya adalah 1,3 m.