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p = 7/3l
K = 180
2 × (p + l) = 180
7/3l + l = 180 : 2
7/3l + 3/3l = 90
10/3l = 90
l = 90 : 10/3
l = 90 × 3/10
l = 27
p = 7/3l
p = 7/3 × 27
p = 63
L = p × l
L = 63 × 27
L = 1701