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misalkan
p = 3y
l = 2y
K = 2(p + l)
60 = 2(3y + 2y)
60 = 2(5y)
10 y = 60
y = 6
Sehingga:
a. panjang = 3y = 3 x 6 = 18 cm
b. lebar = l = 2 y = 2 x 6 = 12 cm
c. luas = L = p x l = 18 x 12 = 216 cm²
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