The volume of the cone is 9 cubic centimeters and the height is 2 cm. What is the area of the base of the cone?
圆锥的体积是9立方厘米，高是2厘米，圆锥的底面积是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9 / (1/3) / 2</gadget>
<output>27/2 = around 13.5</output>

<result>27/2 = around 13.5</result>