A can with label paper on the side has a bottom radius of 8 cm and a height of 10 cm. What is the area of the label paper in square centimeters? (not counting joints)
一个侧面贴有商标纸的罐头盒，底面半径是8厘米，高是10厘米，商标纸的面积是多少平方厘米？(接头处不计)
<gadget id="calculator">3.14 * 8 * 2 * 10</gadget>
<output>502.4</output>

<result>502.4</result>