There is a 1m long cylinder of wood, if it is cut into three sections, the surface area increases by 28.26dm**2 compared to the original, what is the bottom area of this wood dm**2?
有一根1m长的圆柱体木料，如果把它截成三段，表面积比原来增加了28.26dm**2，这根木料的底面积是多少dm**2．
<gadget id="calculator">28.26 / 4</gadget>
<output>7.065</output>

<result>7.065</result>