A metal cone with a bottom diameter of 60 cm is put into a cylindrical cup with a bottom diameter of 80 cm (the cup contains water), and the water level rises by 3 cm. What is the height of the metal cone in centimeters?
把一个底面直径为60厘米的金属圆锥，投入到底面直径为80厘米的圆柱形杯内(杯内装有水)，这时水面上升3厘米．金属圆锥的高是多少厘米？
<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">40 ** 2</gadget>
<output>1_600</output>

<gadget id="calculator">3.14 * 1_600 * 3</gadget>
<output>15_072</output>

<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">30 ** 2</gadget>
<output>900</output>

<gadget id="calculator">3.14 * 900</gadget>
<output>2_826</output>

<gadget id="calculator">3 / 2_826</gadget>
<output>1/942 = around 0.001062</output>

<gadget id="calculator">15_072 * (1/942)</gadget>
<output>16</output>

<result>16</result>