Special Triangles (year 1)

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 1

00:59

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

02:45

How many axes of symmetry does an equilateral triangle have?

1. 0 axes of symmetry
2. 1 axis of symmetry
3. 2 axes of symmetry
4. 3 axes of symmetry

03:13

How may axes of symmetry does an isosceles triangle have?

1. 0 axes of symmetry
2. 1 axis of symmetry
3. 2 axes of symmetry
4. 3 axes of symmetry

04:20

Copy the table from the screen into your notebook. 

Give this table a title: Types of triangles.

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.

04:38

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

04:52

Why is an equilateral triangle always an acute triangle?

05:08

Complete your table about 

Types of triangles

Agenda

What we're doing today:

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

Theory 9.3A