# 7-3 Calculations with the tangent

7-3 Calculations with
the tangent (p. 14)

What you need:
- Pen, pencil, geotriangle
- Calculator

Schoolbags in the cuboard
Phones in the phonebag
Bluetooth
- ON
- VPN off
1 / 27
Slide 1: Slide
WiskundeMiddelbare schoolhavoLeerjaar 3

This lesson contains 27 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

## Items in this lesson

7-3 Calculations with
the tangent (p. 14)

What you need:
- Pen, pencil, geotriangle
- Calculator

Schoolbags in the cuboard
Phones in the phonebag
Bluetooth
- ON
- VPN off

#### Slide 1 -Slide

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

#### Slide 2 -Slide

Make question 12 (p 14)
timer
2:00

tan
P=
A
10/26
B
26/10
C
24/26
D
10/24

P=
A
21
B
23
C
43
D
70

#### Slide 6 -Slide

Right angle not always at the bottom
Tips:
1. Work with the two sides adjacent to the right angle.
2. Use the acronym TOA

Try 13 (p14)
timer
2:00

B=
A
31
B
37
C
39
D
53

B=

#### Slide 10 -Slide

Make question 14 (p. 14)
timer
4:00

P=
A
22
B
23
C
24
D
67

Q=
A
22
B
23
C
24
D
66

R=
A
25
B
28
C
41
D
62

S=
A
30
B
37
C
39
D
53

#### Slide 16 -Slide

So what if you want to calcualte an unknown side?

#### Slide 18 -Slide

Make question 18 (p. 15)
timer
3:00

#### Slide 20 -Slide

1, 2, 5 and 7

RULES:
• Use: Textbook
• Discussion when you are stuck is allowed

timer
12:00
Extra excercise: none
Challenge: none
15, 16, 17
(p. 15)