If the radius of the base of the cylinder is doubled and the height remains the same, its volume will be doubled
圆柱的底面半径扩大2倍，高不变，它的体积就扩大多少倍
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<result>4</result>