Trigonometry Section 4.3

1
Trigonometry Section 4.3

• Right Triangle Trigonometry

2
Special Right Triangles

• A unit circle has a radius of _____.
• The hypotenuse is _____ of a triangle.
• The hypotenuse of the triangles inside the unit
  circle has a length of _____.
  
• Special triangle 30-60-90
• Special triangle 45-45-90
• Fill in the unit circle.

3
SOHCAHTOA

• SOHCAHTOA is an acronym to help us remember the
  right triangle definitions.
  
• S stands for _____.
• C stands for _____.
• T stands for _____.
• O stands for _____.
• A stands for _____.
• H stands for _____.

4
Right Triangle Definitions of Trig Functions

• Therefore, SOH means _____.
• CAH means _____.
• TOA means _____.
• Adjacent and opposite are terms relative to the
  _____.
  
• Sine, cosine, and tangent are ratios of
  triangles.
  
• So why are sine and cosine always between -1 and
  1?

5
Evaluating Trig Functions

• Ex 1
• Memorize all identities
• Reciprocal identities
• Quotient identities
• Pythagorean identities
• Ex 4
• Ex 5
• Ex 7

6
Homework

• Worksheets 3 4
• 1-60, Applications 61-66