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Pak Hadi memiliki sebidang tanah berbentuk persegi panjang dengan keliling 72 km. Ukuran panjang

Rani Maharani

Soal

Pak Hadi memiliki sebidang tanah berbentuk persegi panjang dengan keliling 72 km. Ukuran panjang tanah tersebut merupakan 3 kali ukuran lebarnya. Berapa luas sebidang tanah yang dimiliki Pak Hadi?

pembahasan

Keliling persegi panjang = 2(p + l)

Diketahui p = 3l, sehingga

Keliling persegi panjang = 2(3l + l)

72 = 2(4l)

36 = 4l

l = 9 km

p = 3l = 3(9) = 27 km

Luas persegi panjang = p x l = 27 km x 9 km = 243 km²

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