If the height of a cone remains the same, if the radius of its base is doubled, how many times its volume will be enlarged
一个圆锥的高不变，如果它的底面半径扩大到原来的2倍，那么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>