A file folder is a kind of folder that holds loose papers together for organization and protection. File folders usually consist of a sheet of heavy paper stock or other thin, but stiff, material which is folded in half, and are used to keep paper documents. They are often used in conjunction with a filing cabinet for storage. File folders can easily be purchased at office supply stores. Angles smaller than a right angle, less than 90°, are called acute angles. The angle highlighted in green is acute and the angle highlighted in yellow and green is also acute.
I got my information about folders from: http://en.wikipedia.org/wiki/File_folder
I took this picture myself. The folder is from office depot.
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