There is a cylinder with a diameter of 10 cm at the bottom. If the height increases by 2 cm, how many square centimeters does the lateral area increase?
有一个圆柱体，底面直径10cm，若高增加2cm，则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>