Unfold the sides of a cylinder to obtain a square. The diameter of the base of the cylinder is 8 cm. What is the height of the cylinder in cm?
把一个圆柱的侧面展开，得到一个正方形，这个圆柱的底面直径是8cm，圆柱的高是多少cm．
<gadget id="calculator">3.14 * 8</gadget>
<output>25.12</output>

<result>25.12</result>