Cosine (t3g)

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 3

Cosine

March 19th

t3g

11:00

Camera ON

Schedule

• Announcements                                             5 min
• Review: sine                                                     10 min
• Cosine                                                                10 min
   Quiz questions
• Practice                                                             35 min
   Break-out rooms
  

Programme

Now also in Teams!

Files - Lesmateriaal - Study planners

Got It

'November' info not applicable

Amount of exercises done is visible

Work on it in the time given

Test ch.1

3 students

Redo (max grade 5.5):

    Tuesday, March 23rd, 5th period

Test ch.3

Was summative! So check SOM later

Redo (max grade 5.5):

    Thursday, April 13th, 5th period

Want to join? Let me know (end of the lesson)

Test ch.4-6-7.1

Video this afternoon

Announcements

No more quizzes

Instead: 50% Parabola Project

                  25% quiz 1

                  25% quiz 2 

Last lesson's

Intended Learning Outcomes

At the end of the lesson you could...

1. Use tan and tan      appropriately
   
2. Calculate sides with sine

−1

____Review____
Calculate angle A in the triangle on the right. Try to explain (in words or math) the required steps.
Done? Read theory A (p.62) and try 42

Today's

Intended Learning Outcomes

At the end of the lesson you can...

1. Use sin, cos and tan and their inverses appropriately

Cosine

−1

cos(∠)=​H​​A​​

cos(​H​​A​​)=∠

Cosine

                                           Example: calculate BC.

−1

cos(∠)=​H​​A​​

cos(​H​​A​​)=∠

Cosine

                                         Example: calculate          .

−1

cos(∠)=​H​​A​​

cos(​H​​A​​)=∠

∠B

Trigonometric ratios

How to remember

SOH

CAH

TOA

                                                                                         

Trigonometric ratios

How to remember

SOH

CAH

TOA

                                                                                         

cos(∠)=​H​​A​​

sin(∠)=​H​​O​​

tan(∠)=​A​​O​​

Trigonometric ratios

Want to know a side?                                        Want to know an angle?

Use sin/cos/tan                                                   Use sin   /cos   /tan

                                                                                       calculator:

                                                                                      shift --> sin/cos/tan

                                                                                         

−1

−1

−1

You want to know
the length of KM.
What do you use?

1. Tangent
2. Sine
3. Inverse sine
4. Inverse cosine

You want to know
the size of
What do you use?

∠C.

1. Tangent
2. Sine
3. Inverse sine
4. Inverse cosine

You want to know
the length of LM.
What do you use?

1. Inverse sine
2. Inverse cosine
3. Tangent
4. Cosine

Exercises

                                   Chapter 7

Math A/C

Do 42, 43, 44, 45, 46,
47, 48, 51, 52, 53, 55, 56,
57, 58 and 59

...and check SOM to see if you want to redo test ch.3!

Math B/D

Do 42, 48, 49, 51, 56, 57, 58, 59, 60, 61 and 62

Test ch.3

Was summative!

Redo (max grade 5.5):

    Thursday, April 13th, 5th period

Want to join? Let me know now