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240 = 5p . 3p
240 = 15p
240/15 = p
16 = p
panjang = 5.16 = 80
lebar = 3.16 = 48
K = 2(p+l)
= 2 ( 80+48)
= 2. 128
=256
5p x 3p=240
15p^2 =240
p^2= 16
p=4
pjg= 5p= 20
lbr=3p=12
k=2(p+l)
k=2(20+12)
k=2(32)= 64cm