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Lebar (l) = x
Maka keliling persegi panjang adalah
2(p+l) = 64
2(3x + x) = 64
2(4x) = 64
4x = 32
x = 8
Maka panjang persegi panjang = 3x = 24 cm
dan lebar persegi panjang = x= 8 cm