16. A Trillion Triangles

Price $25 (including postage) - NEW EDITION - 2018


The book explains trigonometry in a simple way beginning with squares and square roots and Pythagoras Theorem up to solution of trig equations. It is aimed at the child and forms a complete and self-contained introduction to the subject. Suitable for children around grade 7. This is a new and very easy approach to trigonometry that begins with triples like 3,4,5 which the children make themselves from thin card and then use in various ways. Four new chapters have been added in this new edition - on solution of right-angled triangles. Please see Contents for the full range of topics covered.


English Chinese (Traditional) Dutch Finnish French German Hindi Korean Russian Ukrainian