Download Lesson 4.2

Start Up Day 20
Questions?
OBJECTIVE: SWBAT use right triangle
trigonometry to determine exact values for
trigonometric functions of acute angles.
SWBAT solve right triangle problems by
using Trigonometry.
ESSENTIAL QUESTION: How are the 6
trigonometric functions defined for the acute angle
within a right triangle?
HOME LEARNING: Pg. 335 # 2,6, 10, 16, 10, 20, 21,
25, 36. 41, 45, 51, 56 & 61
Lesson 4.2
Trigonometric Functions of Acute Angles
“The Best Angle in Which To Approach Any Problem Is The
Try-Angle”
Can You Correct the
Scarecrow?
O http://robertkaplinsky.com/work/wizard-of-
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Right Triangle Trigonometry
Our Special Ones
30°-60°-90°
An altitude to any side of an
equilateral triangle creates
two congruent
30°– 60°–90° triangles
Take 10….What about 60°?
Let’s Try a Few…p. 335 # 1 & 3
Your Turn…p. 335 #9
“When in Doubt, Sketch it Out!”
Calculator? MODE is Key!
Do you recognize the decimal value?
Calculate the csc 30°
CAUTION: DON’T USE the Inverse Trig Keys to Evaluate cot, sec,
and csc There are no buttons on most calculators for cotangent,
secant, and cosecant. They can be easily evaluated by finding tangent,
cosine, and sine, and then taking the reciprocals respectively.
Using Trig to Solve Problems
Solving Right Triangles….#49 & 52
Let’s Try a few more…#55 & 62
Wrapping it Up!
1. Quiz for 4.1 & 4.2 will be taken on MathXL
2. Re-test for Unit 2 for a max score of 70%
will also be taken on MathXL.
3. Last day of the first Quarter is Monday,
October 26th.
4. All makeups and re-takes must be
completed by Monday!