If the radius of the base of a cone is doubled and the height is tripled, its volume will be doubled.
一个圆锥的底面半径扩大2倍，高扩大3倍，它的体积就扩大多少倍．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>