The area ratio of the big and small circles is 9:1, and the difference in circumference is 12.56 cm. What is the area of the small circle in square centimeters?
大、小两个圆的面积比为9：1，周长相差12.56厘米，小圆的面积是多少平方厘米？
<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>