If the area of the base of a cylinder is 18 square decimeters, what is the area of the base of a cone with the same height and volume as the cylinder?
一个圆柱的底面积是18平方分米，与它高相等、体积也相等的圆锥的底面积是多少平方分米．
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<result>54</result>