7-3 Calculations with the tangent

• Wiskunde
• Middelbare school
• havo
• Leerjaar 3

7-3 Calculations with 

the tangent (p. 14)

What you need:

- Textbook, writingbook, iPad

- Pen, pencil, geotriangle

- Calculator

Schoolbags in the cuboard

Phones in the phonebag

Bluetooth 

- ON

- VPN off

Lesson goal

• Calculate the tangent. 
• calculate an unknown side if the angle and another side is given.

Make question 12 (p 14)

tan

∠P=

1. 10/26
2. 26/10
3. 24/26
4. 10/24

∠P=

1. 21
2. 23
3. 43
4. 70

Right angle not always at the bottom

Tips:

1. Work with the two sides adjacent to the right angle.

2. Use the acronym TOA

tan∠A=​adjacent​​opposite​​

Try 13 (p14)

∠B=

1. 31
2. 37
3. 39
4. 53

∠B=

Make question 14 (p. 14)

∠P=

1. 22
2. 23
3. 24
4. 67

∠Q=

1. 22
2. 23
3. 24
4. 66

∠R=

1. 25
2. 28
3. 41
4. 62

∠S=

1. 30
2. 37
3. 39
4. 53

So what if you want to calcualte an unknown side?

And then the adjacent side?

Make question 18 (p. 15)

Try on your own

1, 2, 5 and 7

TRY ON YOUR OWN...

RULES:

• In your writingbook
• Use: Textbook
• Discussion when you are stuck is allowed

Extra excercise: none

Challenge: none

15, 16, 17

(p. 15)