A piece of cylindrical wood has a base radius of 20 cm and a height of 2 meters. If this piece of wood is sawn from the middle into two cylinders of the same size, how much does the surface area increase?
一段圆柱形木材的底面半径是20厘米，高是2米，将这段木材从中间锯成两个-样大小的圆柱，表面积增加了多少？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) ** 2</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">3.14 * (1/25) * 2</gadget>
<output>0.2512</output>

<result>0.2512</result>