A cone has a volume of 314cm**3 and a base radius of 5cm. How tall is it?
一个圆锥，它的体积是314cm**3，底面半径5cm．它的高是多少？
<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">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">314 / (1/3) / 78.5</gadget>
<output>12</output>

<result>12</result>