A cylinder has a base diameter of 2 decimeters and a height of 2 decimeters, what is the lateral area in square decimeters?
一个圆柱体，底面直径是2分米，高2分米，侧面积是多少平方分米．
<gadget id="calculator">3.14 * 2 * 2</gadget>
<output>12.56</output>

<result>12.56</result>