Cast a conical steel ingot with a bottom radius of 5cm and a height of 18cm into a cylindrical part with a bottom radius of 4cm. What is the height of the cast part?
把底面半径是5cm，高是18cm的圆锥形钢锭铸成一个底面半径是4cm的圆柱形零件，铸成零件的高是多少？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

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

<gadget id="calculator">3.14 * 25 * 18 * (1/3)</gadget>
<output>471</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">471 / 50.24</gadget>
<output>9.375</output>

<result>9.375</result>