Master Zhang casts a conical cast iron casting with a bottom diameter of 20cm and a height of 9cm to a cylindrical casting with a bottom diameter of 10cm. What is the height of the cylindrical casting?
张师傅用一个底面直径为20cm，高为9cm的圆锥形生铁铸件，铸造成一个底面直径为10cm的圆柱形铸件，铸成的圆柱形铸件的高是多少厘米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">(1/3) * 3.14 * 100 * 9</gadget>
<output>942</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">942 / 78.5</gadget>
<output>12</output>

<result>12</result>