A stone is placed in a cylindrical glass container with a bottom circumference of 25.12 cm, and the water surface is 20 cm high. Now take out this stone, the water level drops 2 cm. What is the volume of this stone in cubic centimeters?
将一块石头放入一个底面周长是25.12厘米的圆柱形玻璃容器中，这时水面高20厘米．现在将这块石头取出，水面下降2厘米．这块石头的体积是多少立方厘米？
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 2</gadget>
<output>100.48</output>

<result>100.48</result>