Question

Calcular el área de la corona circular, si: R = 8 cm y r = 5 cm.

Answer 1

Respuesta:

          $39\pi cm^{2}$                 ó            $122.46cm^{2}$

Explicación paso a paso:

Radio mayor: R = 8 cm

Radio menor: r = 5cm

$\pi =3.14$

Area de la corona circular: Ac = ?

Fórmula:

$Ac = \pi (R^{2} -r^{2} )$

$Ac = \pi [ (8cm)^{2} -(5cm)^{2} ] = \pi (64cm^{2} -25cm^{2} )$

$Ac = \pi (39cm^{2} )$

$Ac = 39\pi cm^{2}$

$Ac = (3.14)(39cm^{2} )$

$Ac = 122.46cm^{2}$