A cylindrical steel bar is 5 decimeters long. If the steel bar is cut into 4 sections, the surface area increases by 18.84 square decimeters. What is the area of the bottom of the steel bar in square decimeters?
一个圆柱形钢条长5分米，如果把这个钢条截成4段，表面积增加18.84平方分米，这个钢条的底面积是多少平方分米．
<gadget id="calculator">18.84 / 6</gadget>
<output>3.14</output>

<result>3.14</result>