GRADE 9 ASP :

CHAPTER 8 – TRIGONOMETRIC RATIOS

WHAT I NEED TO KNOW - SUMMARY

A Trigonometric Ratio is a Ratio of two sides of a Right Angle:

Remember : SOH CAH TOA

Sin A = OH

Cos A = AH

Tan A = OA

Another way of Remembering it:

Silly Old Hens, Cackle And Hail, Till Old Age

Well done!….Now try some Questions - Required Exercises from ‘What I need to know.’ Chapter 8.2 .Tick it off!!

CHAPTER 8.2 EXTENTION –Trigonometric Ratios and Complementary Angles: - PLEASE add to study. This is new….but easy !!!

Know this above.

CHAPTER 8.3 - Solving Right Triangles

To find angles use 2 nd Function on your Calculator (2 ND Function sin−1)

Remember the distance Formula!!!! Use it below.

A little Check for you. First Close the Answers and Check if you get the same Answer.

Well done .No revise Required Questions of 8.2 and 8.3 and tick off!! Ask teacher if you do not understand.

CHAPTER 8.4 – Angles of Elevation and Depression

Remember Z- Angles – Alternate Angles are Equal.Use this fact below!!!

A little Check for you. First Close the Answers and Check if you get the same Answer.

Well done you are finished with Chapter 8. Now revise Required Exercises.