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42 = 2(2,5l) + 2l
42 = 5l + 2l
42 = 7l
l = 6cm
p = 2,5l
p = 2,5 x 6
p = 15 cm
42 = 2(2,5l) + 2l
42 = 5l + 2l
42 = 7l
l = 6cm
p = 2,5l
p = 2,5 x 6
p = 15 cm