A cylindrical container has a radius of 5dm and a height of 8dm measured from the inside. After it is filled with water, pour the water into a cuboid container with a length of 10dm, a width of 10dm, and a height of 9dm. How high is the water surface?
一个圆柱形容器从里面量它的半径是5dm，高是8dm，盛满水后，把水倒入一个长10dm，宽10dm，高9dm的长方体容器中，水面高几分米？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">8 / 100</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">3.14 * 25 * (2/25)</gadget>
<output>6.28</output>

<result>6.28</result>