A cylinder has a lateral area of 25.12cm**2 and a height of 4cm. What is the diameter of its bottom in cm?
一个圆柱的侧面积是25.12cm**2，高4cm，它的底面直径是多少cm．
<gadget id="calculator">25.12 / 4 / 3.14</gadget>
<output>2</output>

<result>2</result>