The radius of the base of a cylinder is 8 cm, and its lateral expansion is exactly a square. What is the height of the cylinder in cm?
一个圆柱的底面半径是8厘米，它的侧面展开正好是一个正方形，这个圆柱的高是多少厘米．
<gadget id="calculator">2 * 3.14 * 8</gadget>
<output>50.24</output>

<result>50.24</result>