If a cylinder with a base radius of 1 decimeter is cut into two cylinders of the same size, how many square decimeters will the surface area increase compared with the original?
把一个底面半径是1分米圆柱体切成两个同样大小的圆柱，表面积与原来相比增加了多少平方分米？
<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<result>6.28</result>