A cylinder has a base diameter of 2.5 decimeters and a height of 6 decimeters. What is the lateral area of this cylinder?
一个圆柱的底面直径是2.5分米，高6分米．这个圆柱的侧面积多少．
<gadget id="calculator">3.14 * 2.5 * 6</gadget>
<output>47.1</output>

<result>47.1</result>