The mathematical study of triangles has just got a whole lot simpler, according to a researcher who says his new theory of trigonometry is easier to use and more accurate. Associate Professor Norman ...

Revise the different types of angles and rules for calculating angles. This guide includes interactive activities and a quiz. NEW: Angles in parallel lines Revise alternate, correspondent or ...

THIS text-book is not intended to meet the requirements of any special syllabus, but is simply an elementary course on trigonometry. On this account, the authors have had a free path to pursue, and ...