The height and base radius of a cone are equal to the side lengths of a cube. Given that the sum of the sides of the cube is 36 cm, find the volume of the cone.
一个圆锥的高和底面半径都等于一个正方体的棱长．已知这个正方体的棱长总和是36厘米，求这个圆锥的体积．
<gadget id="calculator">36 / 12</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>