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L = 2πr=πD donde r es el radio y D el diámetro
Entonces L = πD = π(70 mm) = 219.9114857 mm
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Área del círculo:
Área = πr^2 = π(D^2/4)
Entonces Área = π(D^2/4) = π((70 mm)^2/4) = 3848.451000 milímetros cuadrados