Jawapan

2015-04-25T21:50:22+08:00
Misal :  lebar = x
p = 2 × lebar = 2x

perimeter = 2(p+l)
           20 = 2(2x + x)
           20 = 4x + 2x
           20 = 6x
             x = 20/6
             x = 3 \frac{2}{3} cm
lebar = 3 \frac{2}{3} cm
1 2 1