The circumference of circle A is 12.56CM, the circumference of circle B is 18.84CM, the area of circle A is the area of circle B
甲圆的周长是12.56CM，乙圆的周长是18.84CM，甲圆的面积是乙圆面积的多少
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>