If the radius of a circle is reduced to the original (1/4), then the area is reduced to the original
一个圆的半径缩小到原来的(1/4)，则面积缩小到原来的多少
<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<result>1/16 = around 0.0625</result>