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K = 2(p+l)
46 = 2(3+3l+l)
23 = 3+4l
4l=20
l = 5 cm
p = 3+3l
= 3 +3*5
p = 18 cm
k = 2p+2l
46 = 2p + 2l
23 = p+l
23 = 3l + 3 + l
23 - 3 = 4l
4l = 20
l = 20/4
l = 5
p= 3(5) + 3
p = 15 + 3
p = 18