If the height of a cylinder is reduced by 2 centimeters, its surface area is reduced by 25.12 square centimeters. What is the area of a base of this cylinder in square centimeters?
一个圆柱体的高度减少2厘米，它的表面积就减少了25.12平方厘米，这个圆柱体的一个底面积是多少平方厘米？
<gadget id="calculator">25.12 / 2 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<result>12.56</result>