The diameter of circle A is three times the diameter of circle B, what is the area of circle B equal to the area of circle A?
A圆的直径是B圆直径的3倍，B圆的面积是A圆面积的多少
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>