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what is the best estimate of the area of the shaded region?

What Is The Best Estimate Of The Area Of The Shaded Region class=

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Daniel2019360id
area of outer circle=[tex]11^{2} * \pi [/tex]=121[tex] \pi [/tex]
area of inner circle=[tex]4^{2} * \pi =16 \pi [/tex]
area of shaded part=[tex]121 \pi -16 \pi =105 \pi [/tex]