A cylinder has a height of 8 decimeters and a base diameter of 2 decimeters. How much is the surface area increased by cutting it into two half cylinders evenly along the diameter of its base.
一个圆柱体的高是8分米，底面直径是2分米．沿着它的底面直径平均切开成两个半圆柱，表面积增加了多少．
<gadget id="calculator">8 * 2 * 2</gadget>
<output>32</output>

<result>32</result>