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Area of a Circle

circle diameter 4

area of a Circle formula
\( A \;=\; \pi \cdot r^2 \) 
Symbol English Metric
\( A \) = area \( in^2 \)  \(\ mm^2 \)  
\( \pi \) = Pi \(3.141 592 653 ...\) \(3.141 592 653 ...\)
\( r \) = radius \( in \) \(mm  \)

 

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