A cylinder has a base area of 314 square decimeters and a height of 7 decimeters, what is the side area of the cylinder in square decimeters?
一个圆柱的底面面积是314平方分米，高是7分米，这个圆柱的侧面积是多少平方分米．
<gadget id="calculator">2 * 3.14 * 10 * 7</gadget>
<output>439.6</output>

<result>439.6</result>