# Special Triangles (year 1)

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Slide 1: Slide
WiskundeMiddelbare schoolvwoLeerjaar 1

This lesson contains 13 slides, with interactive quizzes, text slides and 1 video.

Lesson duration is: 50 min

## Items in this lesson

#### Slide 2 -Video

00:59
Which types of angles do you know? Write down as many as you know.

#### Slide 3 -Open question

02:45
How many axes of symmetry does an equilateral triangle have?
A
0 axes of symmetry
B
1 axis of symmetry
C
2 axes of symmetry
D
3 axes of symmetry

#### Slide 4 -Quiz

03:13
How may axes of symmetry does an isosceles triangle have?
A
0 axes of symmetry
B
1 axis of symmetry
C
2 axes of symmetry
D
3 axes of symmetry

#### Slide 5 -Quiz

04:20
Copy the table from the screen into your notebook.
Give this table a title: Types of triangles.

#### Slide 6 -Slide

04:24
Draw examples of an scalene acute triangle and an scalene obtuse triangle
into the table in your notebook.
Remember: in a scalene triangle the lengths of all the edges in the triangle are different.

#### Slide 7 -Slide

04:38
Draw examples of an isoscles right-angled triangle into the table in your notebook.

#### Slide 8 -Slide

04:52
Why is an equilateral triangle always an acute triangle?

#### Slide 9 -Open question

05:08
Types of triangles

#### Slide 12 -Slide

Agenda
What we're doing today:

• Special triangles
• Isosceles triangles
• equilateral traingles
• right-angled triangles

Theory 9.3A