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LP = 198
l = 6
t = 3
mk :
Lp = 2 x (pxl + pxt + lxt)
198 = 2 x (6p + 3p + 6x3)
198 = 2 x (9p + 18)
198 = 18p + 36
18p = 198-36
p = 162/18
p = 9 cm