The diameter of the small circle and the radius of the large circle are both 2 cm. What is the area of the small circle equal to the area of the large circle?
小圆的直径和大圆的半径都是2厘米，小圆的面积是大圆面积的多少
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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