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l = l
K = 2(p+l)
60 = 2(6+l+l)
60/2 = 2l+6
30 = 2(l + 3)
30/2 = l + 3
15 = l + 3
12 = l
L = pl
= (6 + l)(l)
= 6l + l²
= 6(12) + 12²
= 72 + 144
= 216 cm²
k=2(p+l)
60=2(6+l+l)
60=12+4l
4l=48
l=12
p=6+l
p=6+12=18
l=p x l=12*18= 216 cm^2