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Verified answer
a.panjang rusuk = 7,5 cm- keliling = 4 x s = 4 x 7,5 = 30 cm
- luas = s x s = 7,5 x 7,5 = 56,25 cm2
b.luas = 81 cm²
- panjang sisi = √L = √81 = 9 cm
- keliling = 4 x s = 4 x 9 = 36 cm
c keliling = 60 cm
- panjang sisi = K : 4 = 60 : 4 = 15 cm
- luas = s x s = 15 x 15 = 225 cm2