The diameter of the small circle is 5cm, the radius of the large circle is 5cm, what is the area of the small circle equal to the area of the large circle
小圆的直径是5cm，大圆的半径是5cm，小圆的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>