A cylinder, if the height is reduced by 2 cm, then the surface area is reduced by 12.56 square centimeters. What is the area of the base of this cylinder in square centimeters?
一个圆柱，如果高减少2厘米，那么表面积就减少12.56平方厘米．这个圆柱的底面积是多少平方厘米？
<gadget id="calculator">12.56 / 2 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

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

<result>3.14</result>