A piece of cylindrical steel is 28 cm long and 4 cm in diameter at the bottom. Now it is necessary to forge this piece of steel into a conical steel with a bottom area of 50.24 square centimeters. How tall is the conical steel?
一段圆柱形的钢材，长28厘米，底面直径为4厘米，现在要把这段钢材锻造成底面积是50.24平方厘米的圆锥形钢材，圆锥形钢材有多高？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 28</gadget>
<output>351.68</output>

<gadget id="calculator">351.68 / 50.24</gadget>
<output>7</output>

<gadget id="calculator">3 * 7</gadget>
<output>21</output>

<result>21</result>