Euclid's Geometry - Elements
Euclid is credited with the development of geometry. Going through the geometry of Euclid is recommended for all the mathematics students after they complete their study of mathematics texts prescribed by their boards.
Q.E.F. Abbreviation for Latin words " 'quod erat faciendum' which means which was to be done. Given at the end for constructions.
Q.E.D. Abbreviation for Latin words " 'quod erat demonstrandum' which means which was to be demonstrated. Given at the end for proofs.