1. Geometry Sources: Discovering Geometry (2008) by Michael Serra Geometry (2007) by Ron Larson

2.  Trigon – triangle  Metria – measure  “Triangle Measurement” in Greek  Applications in Navigation, Surveying, Astronomy, etc.

3. TRIGONOMETRIC + RATIO Triangle Measurement + Comparison between quantities So what are we comparing in a trigonometric ratio? A trigonometric ratio expresses a comparison between the lenghts of sides of a (right) triangle.

5.  Determine the unknown.

7.  Given: 4 Q a b S R 55 0 Solve for a and b.

8.  Solve for the unknowns. Express in simplest form.

12.  Given: 25 T 14 R S

13.  Determine the angle measures. Express each to the nearest degree.

16.  Given: 16 p n m 11 46 0 Solve for m, n, and p.