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⇒l = l
⇒ kll = 20cm
b) kll = 2(p+l)
20 = 2(2l+l)
20 = 6l
⇒ l =3,33...≈ 3
⇒ p = 6,66...≈ 6
c) luas = p×l
= 6×3
= 18 cm^2