The radius of the base of a cylinder is 1 decimeter, and the height is 5 decimeters. If the height of the cylinder is increased by 2 decimeters, how much will the surface area of the cylinder increase?
一个圆柱底面半径是1分米，高是5分米，如果把这个圆柱的高增加2分米，这个圆柱表面积增加多少？
<gadget id="calculator">3.14 * 1 * 2 * 2</gadget>
<output>12.56</output>

<result>12.56</result>