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l = p-20 cm (pers.1)
Kel. persegi panjang = 2(p+l)
Kel persegi panjang = 2p+2l
120 cm = 2p+2(p-20 cm)
120 cm = 2p+2p-40cm
120 cm + 40 cm = 4p
160 cm = 4p
p = 160/4 = 40 cm