There is a cylinder with a height of 10 cm and a base radius of 5 cm. If the height is reduced by 2 cm, how much is the lateral area reduced?
有一个圆柱，高是10厘米，底面半径是5厘米．若高减少2厘米，则侧面积减少多少．
<gadget id="calculator">3.14 * 5 * 2 * 2</gadget>
<output>62.8</output>

<result>62.8</result>