Similar Triangles

Similar triangles

You need your notebook, calculator and Ipad

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Slide 1: Slide

WiskundeMiddelbare schoolvwoLeerjaar 3

This lesson contains 23 slides, with interactive quizzes and text slides.

Items in this lesson

Similar triangles

You need your notebook, calculator and Ipad

Slide 1 - Slide

Calculate ∠A

timer

1:00

Slide 2 - Open question

Calculate ∠A

Slide 3 - Slide

What is the length of PR?

Slide 4 - Open question

What is the length of PR?

Slide 5 - Slide

11.6 Similar triangles

Slide 6 - Slide

Slide 7 - Slide

Slide 8 - Slide

Which triangle is similar to triangle ABC?

PQR

KLM

DEF

None of the above

Slide 9 - Quiz

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.

Δ A B C

Δ F D E

Slide 10 - Slide

Δ A B C

Δ F D E

Slide 11 - Slide

Δ A B C

Slide 12 - Slide

ABC is congruent with triangle ...?

Δ A B C

Δ A B C

Δ A B C

DEF

DFE

FED

FDE

Slide 13 - Quiz

Δ A B C

Slide 14 - Slide

Calculations in similar triangles

Slide 15 - Slide

Slide 16 - Slide

Slide 17 - Slide

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.

Slide 18 - Slide

What is the length of VS?

timer

1:00

Slide 19 - Slide

Hoe lang is zijde VS?

Slide 20 - Open question

What is the length of VS?

Slide 21 - Slide

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

Slide 22 - Slide

Leerdoelen

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

Slide 23 - Slide