A cylindrical sink with a bottom diameter of 20cm and a height of 12cm contains water. After Xiaoming completely submerges a stone in the water in the sink (the water does not overflow), the water level rises by 2cm. What is the volume of this stone?
一个底面直径为20cm，高为12cm的圆柱形水槽盛有水，小明把一块石头完全浸入水槽中的水后(水没溢出)，水面上升了2cm，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 * 2</gadget>
<output>628</output>

<result>628</result>