The volume of a cone is 9 cubic centimeters, the height is 3 centimeters, what is the area of the base in square centimetres?
一个圆锥的体积是9立方厘米，高是3厘米，底面积是多少平方厘米．
<gadget id="calculator">3 / 3</gadget>
<output>1</output>

<gadget id="calculator">9 * 1</gadget>
<output>9</output>

<result>9</result>