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p = 4/3l
K = 280
2×(p+l) = 280
4/3l+l = 280:2
7/3l = 140
l = 140:(7/3)
l = 140×3/7
l = 60 cm
p = 4/3l
p = 4/3×60 cm
p = 80 cm
L = p×l
L = 80×60
L = 4800 cm2