Unfold the wrapping paper on the side of a cylindrical can to obtain a square. The radius of the bottom of this cylindrical can is 6 cm. What is its height in cm?
把一个圆柱形罐头瓶的侧面包装纸展开，得到一个正方形，这个圆柱形罐头瓶的底面半径是6厘米，那么它的高是多少厘米．
<gadget id="calculator">2 * 3.14 * 6</gadget>
<output>37.68</output>

<result>37.68</result>