A cylindrical steel material with a base radius of 2 cm and a height of 15 cm is made into a conical steel material with a base radius of 3 cm. What is its height?
底面半径2厘米，高15厘米的圆柱形钢材制作成底面半径3厘米的圆锥形钢材，它的高是多少？
<gadget id="calculator">3.14 * 4 * 15</gadget>
<output>188.4</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">188.4 / 28.26</gadget>
<output>6.666667</output>

<gadget id="calculator">3 * 6.666667</gadget>
<output>20.000001</output>

<result>20.000001</result>