The lateral area of a cylinder is 25.12cm**2, the radius of the bottom surface is 2cm, and the height is cm.
一个圆柱的侧面积是25.12cm**2，底面半径2cm，高是多少cm．
<gadget id="calculator">3.14 * 2 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">25.12 / 12.56</gadget>
<output>2</output>

<result>2</result>