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48 cm = 2(2x+x)
48 cm = 2(3x)
48 cm = 6x
x= 8
panjang = 2x = 2(8 cm) = 16 cm
lebar = x = 8 cm
K =4L+2L
48=6L
L=48/6
L =8
P=2*8
=16