Cut a cone along the height to get two isosceles triangles. It is known that the diameter of the base of the cone is 6cm, so what is the volume of the cone in cm**3.
把一个圆锥沿着高切开得到两个等腰三角形，已知圆锥的底面直径是6cm，那么圆锥的体积为多少cm**3．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</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>