The lateral area of a cylinder is 188.4dm**2 and the radius of the base is 2dm. Find the volume of this cylinder.
一个圆柱的侧面积是188.4dm**2底面半径是2dm，求这个圆柱的体积．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">2 * 3.14 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">188.4 / 12.56</gadget>
<output>15</output>

<gadget id="calculator">3.14 * 4 * 15</gadget>
<output>188.4</output>

<result>188.4</result>