If a cylinder is longitudinally cut along a base diameter, a square section with a side length of 8 cm can be obtained. What is the volume of the cylinder?
一个圆柱，沿着一条底面直径纵切后，可以得到一个边长8厘米的正方形截面，这个圆柱的体积是多少．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

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

<gadget id="calculator">3.14 * 16 * 8</gadget>
<output>401.92</output>

<result>401.92</result>