2TH §3.3 Similar figures

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 2

§ 3.3 Similar figures

Learning goals:

you will learn what similar figures are

you will learn how to find out whether two figures are similar

This lesson:

1. Let's talk about the questions from last lesson
2. Discuss exercise 11 and 13 from the homework
3. New THEORY, about § 3.3
4. More new THEORY, about § 3.3
5. Do exercises 18, 19, S20, S21

Theory, part 1.

What to do, to prove SIMILARITY of 2 figures ?!

• work on the ANGLES, and
• work on the SIDES
• both are needed, to prove SIMILARITY !
• the next slide explains this more
• because nothing beats an example!

Theory, part 2.

When to practise this?

In exercises 18, 19, S20, S21 this Method is needed.

So, you have to work on both:

• angles, and
• sides
• only then Similarity (or not) is proved!

Exercises 18, 19, S20, S21

Time for a Joke?

Ask your teacher!

Any questions?

Go on with § 3.3

Exercises 18, 19, S20, S21

Make sure you do not have much Homework!