For cylinders and cones of equal height and volume, the base area of the cylinder is 3.14 square decimeters, what is the base area of the cone?
等高等体积的圆柱和圆锥，圆柱的底面积是3.14平方分米，圆锥的底面积是多少．
<gadget id="calculator">3.14 * 3</gadget>
<output>9.42</output>

<result>9.42</result>