Explicación paso a paso:
[tex]area \: del \: cuadrado = {x}^{2} = {8}^{2} = 64 {cm}^{2} \\ area \: del \: circulo = {r}^{2} \pi \\ area \: region \: sombreada = area \: cuadrado - area \: del \: circulo \\ area \: sombreada = 64 {cm}^{2} - {3}^{2} \pi \\ area \: sombreada = 64 {cm}^{2} - 9\pi \\ area \: sombreada = 64 - 28.27 \\ area \: sombreada = 35.73 {cm}^{2} [/tex]
