A cylindrical container with an inner diameter of 20 cm and a height of 30 cm is filled with water at a depth of 20 cm. A stone was sunk in it, and the water level rose by 8 cm. What is the volume of this stone?
在一个内直径为20厘米，高为30厘米的圆柱形容器里，装有20厘米深的水．在其中沉入一块石头，水面上升了8厘米．这块石头的体积是多少？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<gadget id="calculator">3.14 * 100 * 8</gadget>
<output>2_512</output>

<result>2_512</result>