Respuesta :

The equation for this problem would be A=C^2 divided by 4pi. Plugging in with the numbers it would be, 8pi^2 / 4pi. This then comes to the new equation 64pi / 4 pi when solving this it comes to the solution if 16 being the answer.

Answer: 16

8pi=c
8=d
4=r
4^2pi=a
a=16pi

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