If the radius of the large circle is 5 times the radius of the small circle, what is the area of the small circle equal to the area of the large circle?
大圆的半径是小圆半径的5倍，则小圆面积是大圆面积的多少
<gadget id="calculator">1 / 25</gadget>
<output>1/25 = around 0.04</output>

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