A cylindrical pillar is about 3.14m long and 4m high when wrapped with a rope. What is the volume of the pillar in m**3.
一圆柱形柱子，用绳绕一周约长3.14m，高约4m，柱子的体积约多少m**3．
<gadget id="calculator">3.14 / 3.14 / 2</gadget>
<output>0.5</output>

<gadget id="calculator">0.5 ** 2</gadget>
<output>0.25</output>

<gadget id="calculator">3.14 * 0.25 * 4</gadget>
<output>3.14</output>

<result>3.14</result>