3-4 Similar triangles (p. 84)

Similar triangles (p. 84)
What you need:
- Textbook, writingbook, iPad
- Pen, pencil, geotriangle
- Calculator


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

This lesson contains 22 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 50 min

Items in this lesson

Similar triangles (p. 84)
What you need:
- Textbook, writingbook, iPad
- Pen, pencil, geotriangle
- Calculator


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

Slide 1 - Slide

Slide 2 - Slide

Slide 3 - Slide

Slide 4 - Slide

Slide 5 - Slide

Lesson goals
  • Determine whether triangles are similar
  • Make calculations with similar triangles

Slide 6 - Slide

When are two
triangles similar?

Slide 7 - Mind map

Triangles are similar if ...
  • The corresponding angles are equal
      OR
  • Corresponding sides have all been 
       multiplied by the same scale factor.
One of these conditions must be met

Slide 8 - Slide

Example 1:

Slide 9 - Slide

Example 2:
           TIP:
  • First place the shortest sides together
  • Then the longest sides together
  • Then the remaining side

Slide 10 - Slide

SIMILAR TRIANGLES
NOT SIMILAR TRIANGLES

Slide 11 - Drag question

Slide 12 - Slide

You try 26 (p. 85)
IA

Slide 13 - Slide

26 a
A
Corresponding sides are equal
B
Corresponding angles are equal
C
They are not similar
D
Two corresponding angles are equal

Slide 14 - Quiz

26 c
A
NO
B
Yes, the factor is 1,5
C
Yes, the factor is 2
D
Yes, the factor is 2,5

Slide 15 - Quiz

Slide 16 - Slide

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


timer
15:00
Extra excercise: M4 and M5 (p. 97)
Challenge: C3 (p. 98)
Interactive website end of this presentation
nr
27, 28
p. 85

Slide 17 - Slide

Slide 18 - Slide

Slide 19 - Slide

Slide 20 - Slide

Slide 21 - Slide

Slide 22 - Link