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4s = 2(p + l)
4s = 2(30 + 24)
4s = 2(54)
4s = 108
s = 108/4 = 27
Luas persegi = s x s = 27 x 27 = 729 cm^2
Karena keliling persegi = persegi panjang maka sisi persegi = 108 / 4 = 27.
Jadi luas persegi = 27 * 27 = 729 cm persegi