The diameter of the base of a cylinder is 10 cm. If the height increases by 2 cm, how much does the lateral area increase?
有一个圆柱底面直径是10厘米，高增加2厘米，则侧面积增加多少．
<gadget id="calculator">3.14 * 10 * 2</gadget>
<output>62.8</output>

<result>62.8</result>