Relationship between sin and cos

Trig Ratios SOH-CAH-TOA

SINE Pronounced “sign”

COSINE Pronounced “co-sign”

Pronounced “tan-gent”

Represents an unknown angle Greek Letter q Pronounced “theta” Represents an unknown angle

Sin-Cosine Cofunction

The Sin-Cosine Cofunction

Ex.1: What is sin A? What is Cos C?

Ex. 2

Ex.3: Fill in the blank for the problem below. Sin 50= cos _______

Guided Practice Work on the following problems with your group members. We will review as a class in 5 minutes.

1.What is Sin Z? What is Cos X?

3. Sin 28 = ?

4. Cos 10 = ?

5. ABC where B = 90. Cos A = 3/5 What is Sin C?

6. Sin  = Cos 15 What is ?

7.Draw ABC where BAC = 90 and sin B = 3/5 What is the length of AB? What is tan C? 4 4/3

8. Draw stick-man standing where the angle is and mark each given side 8. Draw stick-man standing where the angle is and mark each given side. Then tell which trig ratio you have. sin H O