If the height of a cylinder is reduced by 1 centimeter, the surface area will decrease by 6.28 square centimeters. What is the area of the base of the cylinder in square centimeters?
一个圆柱体木块，高减少1厘米后表面积就减少了6.28平方厘米，这个圆柱的底面积是多少平方厘米？
<gadget id="calculator">6.28 / 1 / 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>