A cylinder whose base diameter and height are both 10 decimeters, what is its lateral area in square decimeters?
一个圆柱，它的底面直径和高都是10分米，它的侧面积是多少平方分米．
<gadget id="calculator">3.14 * 10 * 10</gadget>
<output>314</output>

<result>314</result>