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Keliling= 2( P + L)
P : L = 3 : 2
P : L = 3a : 2a ....>misal a sebagai pembanding
60= 2 ( 3a + 2a)
30 = 5a
a = 6cm
P(panjang) = 3 x 6cm = 18cm
L(lebar)= 2 x 6cm = 12cm
l = 2x
p : l = 3x : 2x
K = 2 (p + l)
40 = 2 (3x + 2x)
40 = 10x
x = 4
panjang = 3x = 3(4) = 12 cm
lebar = 2x = 2(4) = 8 cm