If the radius of the base of a cone is enlarged by 4 times, and the height is reduced by 2 times, its volume will be enlarged by how many times its original volume.
一个圆锥的底面半径扩大为原来的4倍，高缩小2倍，它的体积就扩大为原来的多少倍．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

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

<result>8</result>