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-oz/

Right Triangle Trigonometry

Our Special Ones

30°-60°-90°

An altitude to any side of an

equilateral triangle creates two congruent30°– 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!

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.

Do you recognize the decimal value?

Calculate the csc 30°

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!