The circumference of the base of a cylinder is 6.28 cm. A stone is placed in a container, the water surface is 8 cm high, and the stone is taken out of the container, the water surface is 5 cm high. Find the volume of this stone.
一个圆柱底面周长是6.28cm．把一个石块放入容器中，水面高8cm，把石块从容器中取出，水面高5cm．求这个石头的体积．
<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 3</gadget>
<output>9.42</output>

<result>9.42</result>