Measure the volume of a potato in a cylindrical container with a bottom diameter of 10 cm. When the potato is completely submerged in water, the water level rises by 4 cm. What is the volume of the potato in cubic centimeters?
用一个底面直径是10厘米的圆柱形容器测量一个土豆的体积，当土豆完全放进水中时，水面上升了4厘米．这个土豆的体积是多少立方厘米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 4</gadget>
<output>314</output>

<result>314</result>