A cone has a base radius of 5cm and a height of 3dm, what is the volume?
一个圆锥体的底面半径为5cm，高为3dm，求体积？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * 30</gadget>
<output>785</output>

<result>785</result>