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54 = 2x(3+L) + 2xL
54 = 6 + 2L + 2L
54 = 6 + 4L
54 - 6 = 4L
48 : 4 = L
12 = L
P = 3 + L
p = 3 + 12
p = 15
Luas = p x L
= 15 x 12 = 180㎠