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84=2(6+l+l)
84=12+4l
72=4l
18=l
Lebar nya = 18cm
maka :
p = 6 + ℓ
Kll = 84 cm
Kll = 2 (p + ℓ)
84 = 2 (p + ℓ)
42 = p + ℓ
42 = 6 + ℓ + ℓ
42 = 6 + 2ℓ
36 = 2ℓ
ℓ = 18 cm
Jadi, lebar persegi panjang itu adalah 18 cm, sementara panjangnya adalah 18 + 6 = 24 cm
Ok