A cylindrical water tank with a base radius of 3 decimeters and a height of 8 decimeters, if a stone is completely submerged in the water tank, the water level rises by 4 decimeters, what is the volume of the stone?
一个底面半径为3分米，高为8分米圆柱形水槽，把一块石块完全浸入这个水槽，水面上升了4分米，这块石块的体积是多少？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 4</gadget>
<output>113.04</output>

<result>113.04</result>