It is known that the base radius and height of a cone are equal to the side length of a cube. The volume of this cube is 729 cubic decimeters. Find the volume of this cone.
已知一个圆锥体的底面半径和高都等于一个正方体的棱长，这个正方体的体积是729立方分米，求这个圆锥体的体积．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * 3.14 * 729</gadget>
<output>763.02</output>

<result>763.02</result>