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Área de un círculo: r^2 × pi
Siendo: r = radio
Diámetro = 2r
Entonces:
En a) :
(2cm)^2 × pi = 4cm^2 pi
En b) :
8cm = 2r
r = 8/2
r = 4cm
(4cm)^2 × pi = 16cm^2 pi
En c) :
(5cm)^2 × pi = 25cm^2 pi