There is a cylindrical container filled with some water, the radius of the bottom surface is 6 cm, and there is a cone inside. After the cone is removed, the water level drops by 0.5 cm. It is known that the height of the cone is 9 cm. Find the area of the bottom of the cone?
有一个圆柱体容器装着一些水，底面半径为6厘米，里面放着一个圆锥，圆锥拿掉后，水面下降了0.5厘米，已知圆锥的高为9厘米，求圆锥的底面积？
<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36 * 0.5</gadget>
<output>56.52</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">56.52 * (1/3)</gadget>
<output>18.84</output>

<result>18.84</result>