There are two squares, one large and one small, with a difference of 20 cm in perimeter and 55 cm in area. What is the area of the small square in square centimeters?
有一大一小两个正方形，它们的周长相差20厘米，面积相差55平方厘米．小正方形的面积是多少平方厘米？
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">55 - 25</gadget>
<output>30</output>

<gadget id="calculator">30 / 2 / 5</gadget>
<output>3</output>

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

<result>9</result>