Project Gutenberg’s Elements of Plane Trigonometry, by Hugh Blackburn This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at Title: Elements of Plane Trigonometry For the use of the junior class of mathematics in the University of Glasgow Author: Hugh Blackburn Release Date: June 25, 2010