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Answer: (48 - 8π) cm²
Please see attached for the solution.

This method works since all the circles are congruent, therefore, all the shaded corners of the small squares (refer to attached) are also congruent.

Please don't hesitate to ask if you have questions. :)
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omg! @AnneC thank you so so much!! I really do appreciate this so much! thank youu! :)
You're welcome