3-4 Similar triangles (p. 84)

• Natuurkunde
• Middelbare school
• havo
• Leerjaar 3

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

Lesson goals

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

When are two
triangles similar?

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

Example 1:

Example 2:

           TIP:

• First place the shortest sides together
  
• Then the longest sides together
  
• Then the remaining side
  

SIMILAR TRIANGLES

NOT SIMILAR TRIANGLES

You try 26 (p. 85)

IA

26 a

1. Corresponding sides are equal
2. Corresponding angles are equal
3. They are not similar
4. Two corresponding angles are equal

26 c

1. NO
2. Yes, the factor is 1,5
3. Yes, the factor is 2
4. Yes, the factor is 2,5

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: M4 and M5 (p. 97)

Challenge: C3 (p. 98)

Interactive website end of this presentation

nr

27, 28

p. 85

https: