In a cylindrical container with a bottom diameter of 20 cm and a water depth of 15 cm, a stone is placed in it, and the water level rises by 2.5 cm. What is the volume of the stone in cubic centimeters?
在一个底面直径为20厘米，水深是15厘米的圆柱体容器中，放入一块石头后，水面上升了2.5厘米，这块石头的体积是多少立方厘米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 2.5</gadget>
<output>785</output>

<result>785</result>