The radius of the small circle is 3 decimeters, the radius of the large circle is 6 decimeters, the area of the small circle is the area of the large circle
小圆的半径是3分米，大圆的半径是6分米，小圆面积是大圆面积的多少
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>