A square is formed when the side of a cylinder with a base radius of 3 cm is developed along a height. What is the height of this cylinder in centimeters.
把底面半径是3厘米的圆柱的侧面，沿着一条高展开后是一个正方形．这个圆柱的高是多少厘米．
<gadget id="calculator">2 * 3.14 * 3</gadget>
<output>18.84</output>

<result>18.84</result>