Law of sine and cosine

How do we measure
triangles in real
world?

What is happening this week ? ?

•

Day 1: Use The law of sine to find the missing measure

•

Day 2: Use the law of cosine to find the missing measure

•

Day 3: Application

•

Day 4: enrichment

•

Day 5: quick check

Your grades are updated in

PowerSchool.

quiz 8, quiz 9, quiz 10, and

Padlet post.

Quiz 8 and Quiz 9

Quiz 10

5.5-6 A

6.5-7 A

5 B

6 B

4.5 C

5-5.5 C

4 D

4.5 D

Lower: F

Lower: F

Padelt classwork post : posted 5/5, did not post 0/5

All retakes/make ups should be taken by the end

of Friday.

You need to complete the practice quiz before each
retake/make up. Grab one before you leave the class today.

•Practice Quiz 8 : Past due
•Practice Quiz 9 : Blue
•Practice Quiz 10: Yellow

Day 1

Use The law of sine to
find the missing
measure

I can fluently identify the missing
measure of triangles using The
law of sine to find the

Learning target !

What you need for the lesson ?

•A working calculator
•2 highlighters of different colors.
•Pencil
•Interactive notes
•A Positive attitude

We have practiced using trigonometric
ratios to find side lengths and angle
measurements in right triangles.

The Law of Sines shows the proportional
relationship between angles and their
opposite sides.

It can be used to find side lengths and
angle measurements for any triangle.

Teach

er’s

notes

Let’s start the interactive notes

From example

1 to 6

We will do 1,2, 4, and 5

together;

you will do 3 and 6

yourself.

Open Ended

round to the nearest tenth

Open Ended

round to the nearest tenth

Open Ended

round to the nearest tenth

Open Ended

Describe in your own words, how would you use law of sine to find the missing side of a given triangle?

Open Ended

Describe in your own words, how would you use law of cosine to find the missing side of a given triangle?

Open Ended

round to the nearest tenth

Open Ended

round to the nearest tenth

Open Ended

round to the nearest tenth

Now, on your worksheet you try the
odd ones front and back.
Run into a problem?

✓Firstly, look at the examples that we just

worked on

✓Secondly, ask your partner to see if they have

got an idea.

✓Thirdly, raise your hand ask your teacher.

Once you done these problems, take a
photo of your work, post to Padlet.
The link is on the next page.

•https://padlet.co
m/yjiang587/gm0
hym5e8bfvcjf5

DAY 2

Use the law of cosine to find

the missing measure

WARM UP….

Using the law of sine to Find BC

DAY 2 agenda

• 1. Tuesday bellringer (5 mins)
• 2. Warm up question ( 5 mins)
• 3. Day 1 Padlet worksheet feedback ( 5 mins)
• 4. Interactive notes ( 15 mins)
• 5. Check point ( 5 mins)
• 6. Complete Day 2 worksheet ( 30 mins)
• 7. Small group (20 mins)
• 8. take a photo of day 2 worksheet and post to Padlet. (5 mins)

Open Ended

round to the nearest tenth

Open Ended

round to the nearest tenth

Open Ended

round to the nearest tenth

Open Ended

Describe in your own words, how would you use law of cosine to find the missing side of a given triangle?

Open Ended

round to the nearest tenth

Open Ended

round to the nearest tenth

Open Ended

round to the nearest tenth

Open Ended

Describe in your own words, how would you use law of cosine to find the missing angle of a given triangle?

COMPLETE DAY1 and DAY 2 worksheets
As you are working, waiting to be called for small group.
(take your pencil and notes with you if you are called)

Run into a problem?

✓Firstly, look at the examples that we just worked

on

✓Secondly, ask your partner to see if they have got

an idea.

✓Thirdly, raise your hand ask your teacher.

Once you finish, take a phot from the day 2
worksheet and post to Padlet, the bard code is on
the next slide.

DAY 3

DAY 3 Agenda

1) Bellringer (5 mins)
2) Check point ( 5 mins)
3) ALEKS topic goal 9
4) ALEKS Nov 10thassignment
5) Any retake or make up quizzes.
6) Finish and post both day 1 and day 2 worksheet to Padlet
7) Clean up

Nov. 9thPadlet

https://padlet.com/yjiang
587/z1z0s40al1t5jxvv

Check point

How to login to Aleks

•Turn on your laptop
•Login to clever
•Click McGraw-Hill icon (the red icon).
•Click on Aleks. (if you are not already in, join the class by

this code: VTBFE8G9)
•Finish the Topic goal 9 and Nov. 10th
assignment.

Free choice Friday

Turn on your laptop
login to ALEKS
Finish the Nov. 12th
assignment.

AND

Scale your understanding

Exit Slip