A rectangular paper with a length of 6.28 decimeters and a width of 3.14 decimeters is made into a cylinder with the largest volume without a cover and a bottom (not counting the head), and stands on the table. What is the area of the bottom of this cylinder in square decimeters?
把一个长6.28分米、宽3.14分米的长方形纸做成一个无盖无底容积最大的圆柱(椄头处不计)，立在桌上，这个圆柱的底面积是多少平方分米．
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

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

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

<result>3.14</result>