A cylindrical iron rod 6 cm long is melted into a cone. If the area of the base of the cone is twice the area of the base of the cylinder, what is the height of the cone in cm?
把一个6厘米长的圆柱形铁棍熔成一个圆锥形，如果圆锥的底面积是圆柱的底面积的2倍，那么圆锥的高是多少厘米．
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / (2/3)</gadget>
<output>3</output>

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

<result>9</result>