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<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <mi>π<!-- p --></mi> <mo><!-- ⁢ --></mo> <msup> <mi>r</mi> <mn>2</mn> </msup> </math> | <math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <mi>π<!-- p --></mi> <mo><!-- ⁢ --></mo> <msup> <mi>r</mi> <mn>2</mn> </msup> </math> | ||
