If the radius of the base of a cylinder is tripled and the height is tripled, what is the volume?
一个圆柱的底面半径扩大到原来的3倍，高缩小到原来的3倍，则体积多少．
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<result>3</result>