A cylinder has a base diameter of 10 cm, if the height increases by 2 cm, how much does the lateral area increase by 2 cm?
一个圆柱体，底面直径是10厘米，若高增加2厘米，侧面积增加多少平方厘米．
<gadget id="calculator">3.14 * 10 * 2</gadget>
<output>62.8</output>

<result>62.8</result>