If an isosceles right triangle with a waist length of 30 cm is rotated once around the waist, what is the volume of the cone formed?
一个等腰直角三角形，腰长30厘米，如果以腰为轴旋转一周，所成的圆锥体积是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 ** 2</gadget>
<output>900</output>

<gadget id="calculator">(1/3) * 3.14 * 900 * 30</gadget>
<output>28_260</output>

<result>28_260</result>