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Rumus sisi = keliling : 4
Rumus luas = s x s
a. sisi = 52 / 4 = 13 cm
Luas = 13 x 13 = 169 cm^2
b. sisi = 60 / 4 = 15 cm
Luas = 15 x 15 = 225 cm^2
c. sisi = 128 / 4 = 32 cm
Luas = 32 x 32 = 1.024 cm^2