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Panjang = l + 16 cm
Keliling = 2 x ( p + l )
140 m = 2 x (l+ 16 + l)
140 m = 2 x (2l + 16)
140 m = 4l + 32
4l = 140 - 32
4l = 108 cm
l = 108/4
l = 27 cm
Panjang = l + 16 cm
= 27 cm + 16 cm
= 43 cm
Jadi, panjang dan lebar persegi panjang tersebut berturut-turut adalah 43 cm dan 27 cm