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2 ) A =πR²
78.50
------ = R²
3.14
25 = R²
5 = R ⇒ El radio mide 5 cm
3) Perímetro = 2 π R = 628 cm
628
R=---------
2 π
R = 100 cm
A = π R² = π (100)² = 10000 π =3.14 x 10000=31416. cm²