The diameter of the base of the cone is reduced by 3 times its height and its volume is increased by 3 times.
圆锥体的底面直径缩小3倍高扩大3倍他的体积就多少．
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

<result>3</result>