Put a stone into a cylindrical container with a bottom diameter of 12 decimeters and a height of 15 decimeters. The height of the water surface rises from the original 8 decimeters to 10 decimeters. Find the volume of the stone.
把一块石头，放入一个底面直径12分米，高15分米的圆柱形容器里，水面的高度由原来的8分米上升到10分米，求石头的体积．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<gadget id="calculator">3.14 * 36 * 2</gadget>
<output>226.08</output>

<result>226.08</result>