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44cm = 2(2l+1cm + l)
44cm = 6l + 2
42cm = 6l
l = 7cm
p = 15cm
2 + 4x = 44
2x = 44-2
x = 42/4
x = 10,5
lebar = 10,5/2= 5,25
panjang = 1+ 2(5,25) = 11,5