The difference between the radii of the big and small circles is 5 cm, and the sum of the circumferences of the two circles is 157 cm. What is the area of the small circle in square centimeters?
大小两圆半径之差是5厘米，两圆周长之和是157厘米，则小圆面积是多少平方厘米？
<gadget id="calculator">3.14 * 5 * 2</gadget>
<output>31.4</output>

<gadget id="calculator">157 - 31.4</gadget>
<output>125.6</output>

<gadget id="calculator">125.6 / 2</gadget>
<output>62.8</output>

<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>