If a cylinder with a diameter of 10 decimeters and a height of 8 decimeters is cut into two half cylinders along the 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.
把一个直径是10分米，高是8分米的圆柱体，沿着直径切成两个半圆柱体，这两部分表面积的和比原来圆柱的表面积增加了多少平方分米．
<gadget id="calculator">10 * 8 * 2</gadget>
<output>160</output>

<result>160</result>