Unwrap the side wrapping paper of a cylindrical food can to get a square. The radius of the bottom surface of this cylindrical can is 6 cm. What is the height of the can in cm?
将一个圆柱体食品罐头的侧面包装纸展开，得到一个正方形，这个圆柱体罐头的底面半径6cm，罐头的高是多少cm．
<gadget id="calculator">2 * 3.14 * 6</gadget>
<output>37.68</output>

<result>37.68</result>