Question

Diketahui keliling persegi panjang 40cm. Jika selisih panjang dan lebar nya 4cm hitunglah luas persegi panjang tersebut.

Answer 1

Verified answer

K = 2(P + L)
40 = 2P + 2L
20 = P + L

P - L = 4
P = L + 4

20 = L + 4 + L
20 = 2L + 4
2L = 20 - 4
2L = 16
L = 16/2
L = 8 cm

P = L + 4 = 8 + 4 = 12 cm

Luas = P x L = 12 x 8 = 96 cm^2

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