Thursday, March 22, 2007
Geometry (Class 61)
Overview
Today we put our trigonometric ratios to work to solve for missing sides and missing angles of right triangles using graphs of the trigonometric functions and trigonometric tables. In addition, we learn the names of the three basic trigonometric functions we have been working with. As time permits we will start to examine some special right triangles and the relationships between the lengths of their sides.
Textbook Sections
§9.5 (Txt. p.558) Trigonometric Ratios
§9.4 (Txt. p.551) Special Right Triangles
Key Attitudes
Mathematics is about justification.
Key Ideas
The three basic trigonometric functions are sine=opp/hyp, cosine=adj/hyp, and tangent=opp/adj
Trigonometric ratios can be used to find missing lengths of sides in right triangles and the measure of missing angles.
Trigonometric ratios are different for different angles and can be found by i)measurement, ii)referring to a table or graph, iii) using a calculator
Key Skills
Using trigonometric ratios to solve right triangles.
Writing and solving proportions.
Graphing data.
Using a graph to make predictions.
Vocabulary
sine
cosine
tangent
Handouts
No handouts posted.
Assignment
§9.4 (Txt. p.562) #10-12, 28-30, 34
§9.5 (Txt. p.570) #11, 12, 22-24, 28-30
Use values for Trigonometric Ratios from a calculator or from page 845 of your text.
Disclaimer- The assignment as stated in class is the official assignment. Every effort is made to keep this posting accurate, but you should refer to what was stated in class as the final word.
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