The diameter of the base of a cone is 6cm and the height is 3cm. What is its volume in cm**3.
一个圆锥体的底面直径是6cm，高是3cm，它的体积是多少cm**3．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<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 * 3</gadget>
<output>28.26</output>

<result>28.26</result>