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100 phi = phi × r kuadrat
100 = r kuadrat
r = 10 cm
Maka diameter lingkaran = 10×2 = 20 cm
Maka sisi persegi = 20 + 20 = 40 (karena sisi persegi = 2 kali diameter 1 lingkaran)
Luas persegi = 40 × 40 = 1600 cm persegi