Harry Kretz

Trigonometry: A Practical Introduction presents an approach
that involves the whole being of students so they develop
clarity of thought and enthusiastic involvement in challenging,
meaningful activities. The author advises that, when students
work outdoors or are at at their desks measuring distances
and angles, the topics being discussed are better understood.

Topics include tight triangle calculations; oblique triangle
calculations; surveying problems; and much more, with
helpful notes and suggestions