If the height of the cone remains the same, the radius of the base is reduced to the original (1/5), and its volume is reduced to the original value.
如果圆锥的高不变，底面半径缩小为原来的(1/5)，它的体积缩小为原来的多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) ** 2</gadget>
<output>1/25 = around 0.04</output>

<result>1/25 = around 0.04</result>