Il cerchio: ripasso lunghezza circonferenza
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Vero; Vero; Falso C = 2π * r; Falso d = C/2π
62,8 cm; C = π * d = 5,8 π, 18,21 m; C = 2π * r = 8,4 π, 26,38 cm; C = 2π * r = 58 π, 182,12 cm
37,68 cm
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