Similar Triangles

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• Leerjaar 3

Similar triangles

You need your notebook, calculator and Ipad

Calculate ∠A

Calculate ∠A

What is the length of PR?

What is the length of PR?

11.6 Similar triangles

Which triangle is similar to triangle ABC?

1. PQR
2. KLM
3. DEF
4. None of the above

11.6 Similar triangles

                                                     

Triangle ABC is similar to FDE, so their shapes are equal.

The letters referring to the matching angles are on the same space. So not necessarily in alphabetical order.

ΔABC

ΔFDE

ΔABC

ΔFDE

ΔABC

ABC is congruent with triangle ...?

ΔABC

ΔABC

ΔABC

1. DEF
2. DFE
3. FED
4. FDE

ΔABC

Calculations in similar triangles

Calculations in similar triangles

To calculate lengths in similar triangles, we use a scale factor. In this example the scale factor is 20 : 8 = 2,5. So every side in triangle DEF is 2,5 times as big as the sides in ABC.

What is the length of VS?

Hoe lang is zijde VS?

What is the length of VS?

Bettermarks

• Homework and equipment check
• Bettermarks 11.6 
• Raise your finger if you have any questions or when you're finished
• Communicate in English please

Leerdoelen

• Je kent de drie regels van gelijkvormigheid
  
• Je kan lengtes van zijden uitrekenen met behulp van gelijkvormigheid