If a cylinder with a base diameter of 10 decimeters and a height of 5 decimeters is cut into two equal parts along its diameter, the sum of the surface areas of the two parts is increased by how many square decimeters compared with the surface area of the original cylinder.
把一个底面直径10分米，高5分米的圆柱体，沿着它的直径切成两等份，这两部分表面积的和比原来圆柱体的表面积增加了多少平方分米．
<gadget id="calculator">10 * 5 * 2</gadget>
<output>100</output>

<result>100</result>