A cuboid billet with a base area of 15.7cm**2 and a height of 4cm is cast into three identical conical plumbs. The radius of the bottom of each plumb is 2cm. How many centimeters is the height?
将一块底面积是15.7cm**2，高是4cm的长方体钢坯铸造成3个完全一样的圆锥形铅垂，每个铅垂的底面半径是2cm，高是多少厘米？
<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">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">4 / 3 / (1/3) / 12.56</gadget>
<output>0.318471</output>

<gadget id="calculator">15.7 * 0.318471</gadget>
<output>4.999995</output>

<result>4.999995</result>