The diameter of the bottom surface of a cylindrical container is 10cm, and the area of the inner surface in contact with water is 392.5cm**2. Find the height of this container.
一个圆柱形容器的底面直径为10cm，内部与水接触的面的面积是392.5cm**2，求这个容器的高．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">392.5 - 78.5</gadget>
<output>314</output>

<gadget id="calculator">3.14 * 10</gadget>
<output>31.4</output>

<gadget id="calculator">314 / 31.4</gadget>
<output>10</output>

<result>10</result>