cuboid iron block with a length of 6.28cm, a width of 4cm and a height of 2cm is melted and cast into a cone with a base radius of 2cm. What is the height of the cone? (solution by equation)
把一个长6.28cm，宽4cm，高2cm长方体铁块熔铸成一个底面半径是2cm的圆锥，这个圆锥的高是多少？(用方程解)
<gadget id="calculator">6.28 * 4 * 2</gadget>
<output>50.24</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">(1/3) * 3.14 * 4</gadget>
<output>4.186667</output>

<gadget id="calculator">50.24 / 4.186667</gadget>
<output>11.999999</output>

<result>11.999999</result>