Forge a cylindrical steel material with a base diameter of 4 cm and a height of 10 cm into a cone with a base radius of 4 cm. How high can it be forged?
把一段底面直径4厘米、高10厘米的圆柱体钢材锻造成底面半径是4厘米的圆锥体，可以锻造多高？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 10</gadget>
<output>125.6</output>

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

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

<gadget id="calculator">125.6 / 50.24</gadget>
<output>2.5</output>

<gadget id="calculator">3 * 2.5</gadget>
<output>7.5</output>

<result>7.5</result>