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48=2(2l+l)
48=4l+l
48=6l
l=8
L=p*l
=16*8
=128 m
K = 2(p+l)
48 = 2(2x + x)
48 = 2(3x)
48 = 6x
x = 8 → lebar
p = 2*8 = 16
L = p*l = 16 * 8 = 128