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Areas
Área de una corona circular
 Una corona circular es una figura geométrica plana delimitada por dos circunferencias concéntricas.

Área de una corona circular

 Área = $\pi\;(R^2\;-\;r^2)$

 Calcula el área de la figura sombreada: Área = $\pi\;(R^2\;-\;r^2)$ R=6 Y r=2, por lo que: Área = $\pi\;(6^2\;-\;2^2)$ = $\pi\;(36\;-\;4)$ = $32\pi$

Calcula el área de la corona circular de radios 5 y 10

Utiliza: $\pi=3.14$
Área=