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Jika sisi persegi = 20 cm
K.Persegi = 4 ( s ) = 4 ( 20 cm ) = 80 cm
Maka K.Persegi = 80 cm
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Jika K.Persegi = K.Persegi panjang
Maka Keduanya memiliki keliling 80 cm
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K.Persegi panjang jika panjangnya 25 cm
=> 2 ( p + l ) = 80 cm
=> 2 ( 25 cm + l ) = 80 cm
=> 50 cm + 2l = 80 cm
=> 2l = 80 cm - 50 cm
=> l = 30/2 cm
=> l = 15 cm
Maka lebar persegi panjang adalah 15 cm.