cylinder is cut into two half cylinders along the diameter of the bottom surface, the surface area is increased by 80 square centimeters, the diameter of the bottom surface of the cylinder is 8 cm, what is the height of the cylinder in centimeters.
将一个圆柱体沿着底面直径切成两个半圆柱，表面积增加了80平方厘米，圆柱的底面直径为8厘米，这个圆柱的高是多少厘米．
<gadget id="calculator">80 / 2 / 8</gadget>
<output>5</output>

<result>5</result>