The radius of the base of a cylinder is 5 cm. If the height increases by 2 cm, how much does the lateral area increase by 2 cm?
一个圆柱体底面半径是5厘米，若高增加2厘米，则侧面积增加多少平方厘米．
<gadget id="calculator">3.14 * 5 * 2 * 2</gadget>
<output>62.8</output>

<result>62.8</result>