A cylindrical container filled with water has a bottom diameter of 10 cm and a water depth of 20 cm. A stone is placed in it and the water level rises to 25 cm. What is the volume of the stone in cubic centimeters?
一个盛有水的圆柱形容器，底面直径为10厘米，水深20厘米，放入一块石头，水面升高到25厘米，这块石头的体积是多少立方厘米？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">3.14 * 25 * 5</gadget>
<output>392.5</output>

<result>392.5</result>