The diameter of the small circle is 2 cm, the radius of the large circle is 2 cm, what is the area of the small circle equal to the area of the large circle
小圆的直径是2厘米，大圆的半径是2厘米，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>