If the height of a cone remains the same and the radius of the base is doubled, its volume will be multiplied to the original volume.
一个圆锥的高不变，底面的半径扩大到原来的2倍，它的体积就扩大到原来的多少倍．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<result>4</result>