cylindrical piece of wood has a base radius of 2dm and a height of 26dm. This piece of wood is sawn from the middle into two cylinders of the same size. What is the surface area of one of the cylindrical pieces of wood?
一根圆柱形木材的底面半径是2dm，高是26dm，将这根木材从中间锯成两根同样大小的圆柱，其中一根圆柱形木材的表面积是多少？
<gadget id="calculator">26 / 2</gadget>
<output>13</output>

<gadget id="calculator">2 * 2 * 3.14 * 13</gadget>
<output>163.28</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">163.28 + 25.12</gadget>
<output>188.4</output>

<result>188.4</result>