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B. Luas = 9 x 9 = 81 cm2
Keliling = s + s + s + s atau 4s
Keliling = 36 cm
36 cm = 4s
s = 36 cm : 4
s = 9 cm
maka
a. panjang sisi = 9 cm
b. Luas = s² = 9 cm x 9 cm
= 81 cm²