There are two stones of the same size in a cylindrical container filled with water. The circumference of the bottom of the cylinder is 12.56 cm and the height is 10 cm. After the two stones are taken out of the water, the water depth is reduced by 2 cm. Then a What is the volume of the stone?
一个装满水圆柱形容器里有两个体积完全相同的石块，圆柱的底面周长是12.56厘米，高是10厘米，把两个石块拿出水面后，水深降低了2厘米，那么一个石块的体积是多少？
<gadget id="calculator">12.56 / 2 / 3.14</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 4 * 1</gadget>
<output>12.56</output>

<result>12.56</result>