A conical billet with a bottom diameter of 20 centimeters and a height of 30 centimeters is melted and cast into a cylindrical steel material with a bottom radius of 10 centimeters. How many centimeters is the steel?
把底面直径是20厘来，高是30厘米的圆锥形钢坯，熔铸成一根底面半径是10厘米的圆柱形钢材．钢材长多少厘米？
<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 * 30</gadget>
<output>3_140</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">3_140 / 314</gadget>
<output>10</output>

<result>10</result>