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keliling = 2(p+l)
20 = 2 (3y+2y)
20 = 2(5y)
20 = 10y
y = 20/10
y = 2
panjang = 3y = 3 x 2 = 6 cm
lebar = 2y = 2 x 2 = 4 cm
panjang - lebar = 6 - 4 = 2 cm
leba r=2
p:l=3:2
k= 2(p + l)
20=2(3+2)
20=2(5)
20=10
y=20/10
y=2