A cone with a base radius of 3 decimeters and a height of 4 decimeters. What is its volume in decimeters**3.
一个圆锥体，底面半径3分米，高4分米．它的体积是多少分米**3．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * 4</gadget>
<output>37.68</output>

<result>37.68</result>