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Kita cari dulu ukuran panjang dan lebarnyaK = 2 × ( p + l )
60 = 2 × ( 3x + 2x )
60 = 2 . 5x
60/2 = 5x
30 = 5x
x = 30/5
x = 6 cm
Maka,
panjang = 3x = 3 × 6 = 18 cm
lebar = 2x = 2 × 6 = 12 cm
Setelah p dan l nya ketemu, sekarang kita tinggal mencari Luasnya
L = p × l
= 18 cm × 12 cm
= 216 cm²
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