The diameter of the small circle is 3, the radius of the large circle is 6, the area of the small circle is the area of the large circle
小圆直径是3，大圆半径是6，小圆的面积是大圆面积的多少
<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

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