A cylinder with a base radius of 4 cm is cut from one end to the next. If the side of the cut cylinder is to be a square, what is its height in centimeters?
从一个底面半径是4厘米的圆柱的一端横截下一段．要使截下的圆柱的侧面展开是一个正方形，则它的高是多少厘米．
<gadget id="calculator">2 * 3.14 * 4</gadget>
<output>25.12</output>

<result>25.12</result>