Email Print Area of a Circle on 04 March 2018. Posted in Plane Geometry area of a Circle formula \( A \;=\; \pi \; r^2 \) Symbol English Metric \( A \) = area \( in^2 \) \(\ mm^2 \) \( \pi \) = Pi \(3.141 592 653 ...\) \( r \) = radius \( in \) \(mm \) Tags: Circle
