Sine Cosine or Tangent of Angles

Which trig FUNction(s) is positive in Quadrant I?

• sine

• cosine

• tangent

Which trig FUNction(s) is positive in Quadrant II?

• sine

• cosine

• tangent

Which trig FUNction(s) is positive in Quadrant III?

• sine

• cosine

• tangent

Which trig FUNction(s) is positive in Quadrant IV?

• sine

• cosine

• tangent

What about tangent? Use the triangle to answer the following questions. In terms of x and y, what does tanθ equal? tanθ=​ ​ (a)   In terms of sinθ and cosθ, what does tanθ equal? tanθ=​ (b)  

• x

• y

• sinθ

• cosθ

Find the angle measure.

• A

• B

• C

• D

What is the ratio for Sine?

• Hyp/Opp

• Opp/Hyp

• Opp/Adj

• Adj/Opp

Match the following

• 6/8

• Cos(37^o)

• 8/10

• Sin(37^o)

• 6/10

• Tan(37^o)

Mathematical Equivalence

ON