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L persegi = s² = 2
s = √2
Diagonal persegi = √(√2)²+(√2)² = √2+2 = √4 = 2 cm
diameter lingkaran = diagonal persegi = 2 cm
jari-jari = diameter/2 = 2/2 = 1 cm
Luas lingkaran = πr² = π1² = π cm²
Luas yang berwarna gelap = luas lingkaran-luas persegi = (π - 2) cm² (a)