Keliling persegi

K = 4s

dan, Luas persegi

L = s . s

L = s2

Contoh soal:

Jika diketahui keliling suatu persegi 48 cm, tentukan luasnya !

Penyelesaian:

Keliling (K) = 48 cm

K = 4s

48 = 4s

s = 48/4

s = 12 cm

Luas (L) = s x s

L = 12 x 12

L = 144 cm2

Jadi, luas persegi 144 cm2

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