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160 = 2 (l +20 +l)
160 = 2(2l+20)
160 = 4l +40
4l = 160-40 = 120
l = 120/4 = 30
maka panjang = l + 20 = 30 + 20 = 50 cm
maka lebar = l = 30 cm
p = 20+l
l = l
K = 2(p+l)
160 = 2(20+l+l)
160 = 2(20+2l)
160 = 40+4l
160-40 = 4l
120 = 4l
120/4 = l
30 = l
jadi panjang = 20+l = 20+30 = 50 cm
lebar = l = 30 cm