Luas persegi panjang = p x l
216 = ( l + 6 ) x l
216 = l² + 6l
l² + 6l - 216 = 0
( l - 12 ) ( l + 18 )
l = 12 cm ( B )
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Luas persegi panjang = p x l
216 = ( l + 6 ) x l
216 = l² + 6l
l² + 6l - 216 = 0
( l - 12 ) ( l + 18 )
l = 12 cm ( B )