Trigonometry, by Harry Kretz
$ 12.95

Trigonometry: A Practical Introduction presents anapproach that involves the student's whole self so as to develop clarity of thought and an enthusiastic involvement in challenging, meaningful activities. The authoradvises that if students work outdoors, as well as at their desks, measuring distances and angles, the topics under discussion are better understood.Contents: Right Triangle Calculations; Oblique Triangle Calculations; Problems in Surveying; and many helpful notes and suggestionsHarry Kretz taught high school math for many years at Hawthorn Valley Waldorf School in New York. Since retiring from full-time work, he has worked more than full time travelling to teach courses for a few weeks at a time in various Waldorf schools and in teacher training centers.