cone and a cylinder have the same volume and height, the base area of the cylinder is 9dm**2, what is the base area of the cone dm**2.
一个圆锥和一个圆柱的体积相等，高也相等，圆柱的底面积是9dm**2，圆锥的底面积是多少dm**2．
<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>