Sine and Cosine Ratio

9.5 Sine and Cosine Ratios

By Lisa McClure-Wright

Review tutorial 1, then try example 1 in your notes. Answer is on the next slide.

​Example 1

​

​Notice sin S = cos R and cos S = sin R

​Review tutorial 2, then try example 2 in your notes.

Answer is on the next slide.

​Review tutorial 3, then try example 3 in your notes.

Answer is on the next slide.

Multiple Choice

Find sin D

• $$\frac{7}{24}$$  

• $$\frac{25}{7}$$  

• $$\frac{7}{25}$$  

• $$\frac{24}{25}$$  

Multiple Choice

Find cos F

• $$\frac{25}{24}$$  

• $$\frac{7}{25}$$  

• $$\frac{24}{25}$$  

• $$\frac{24}{7}$$  

Multiple Choice

Write $$\cos\ 23^o$$  in terms of sine

• $$\sin\ 67^o$$  

• $$\sin\ 23^o$$  

• $$\sin\ 157^o$$  

• none of these

Fill in the Blank

Find the value of u using sine or cosine and round your answer to the nearest tenth

Fill in the Blank

Find the value of t using sine or cosine. Write your answer to the nearest tenth.

Review your notes for tutorial 4, then try example 4 in your notes.

Answer is on the next slide.

​Review your notes for tutorial 5, then try example 5 in your notes.

Answer is on the next slide.

Fill in the Blank

Find $$\sin\ 60^o$$   Give your answer rounded to the nearest thousandth

Fill in the Blank

Find $$\cos\ 60^o$$   Give your answer to the nearest thousandth

Multiple Choice

Find the $$\sin\ 60^o$$  

• None of these

• $$\frac{\sqrt[]{2}}{2}$$  

• $$\frac{1}{2}$$  

• $$\frac{\sqrt[]{3}}{2}$$  

Multiple Choice

Find the $$\cos\ 60^o$$  

• $$\frac{1}{2}$$  

• $$\frac{\sqrt[]{3}}{2}$$  

• $$\frac{\sqrt[]{2}}{2}$$  

• None of these

​Review your notes for tutorial 6, then try example 6 in your notes.

Answer is on the next slide.

Open Ended

Exit ticket:

As we have worked on trigonometric functions and special right triangles, what has helped you the most in making sense of this topic?

Lectures by the teacher, lessons online, tutorials, something else? Be sure to use full sentences in your answer.