A cylinder and a cone have the same volume and the same height. The area of the base of the cylinder is 9 square centimeters, what is the area of the base of the cone in square centimetres?
圆柱和圆锥的体积相等，高也相等．圆柱的底面积是9平方厘米，圆锥的底面积是多少平方厘米．
<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>