The base area of a cylindrical piece of wood is 3.14 square decimeters, if it is sawed into 4 small cylinders, how many square decimeters will the surface area increase?
一根圆柱形木材的底面积是3.14平方分米，把它锯成4段小圆柱体，表面积增加多少平方分米．
<gadget id="calculator">3.14 * 6</gadget>
<output>18.84</output>

<result>18.84</result>