If a cylinder has a base radius of 2 decimeters and a height of 5 decimeters, if it is divided vertically into two parts along the diameter, the surface area will increase by how many square decimeters.
一个圆柱底面半径为2分米，高5分米，把它沿着直径竖直平分为两部分，表面积增加了多少平方分米．
<gadget id="calculator">2 * 2 * 5 * 2</gadget>
<output>40</output>

<result>40</result>