A cone and a cylinder have the same base and height. The volume of the cylinder is 30dm**3, what is the volume of the cone.
一个圆锥和一个圆柱等底等高．圆柱的体积是30dm**3，圆锥的体积是多少．
<gadget id="calculator">30 / 3</gadget>
<output>10</output>

<result>10</result>