If the radius and height of the base of a cone are doubled, the volume will be multiplied.
一个圆锥的底面半径和高都扩大2倍，体积就多少倍．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>