cylindrical wooden stick with a length of 2 meters and a cross-sectional diameter of 6dm is cut into 4 pieces, the surface area increases by how many square decimeters.
一根长2米，横截面直径为6dm的圆柱形木棍，截成4段后，表面积增加了多少平方分米．
<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">28.26 * 6</gadget>
<output>169.56</output>

<result>169.56</result>