# 7.2 special triangles

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Slide 1: Slide
WiskundeMiddelbare schoolvwoLeerjaar 1

This lesson contains 21 slides, with interactive quizzes and text slides.

## Items in this lesson

program
- get notebook

- exercises

#### Slide 3 -Slide

lessonUp
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triangles

#### Slide 5 -Mind map

triangles
tri  means three
angle means angle

together triangle

#### Slide 7 -Slide

what is the sum of the three angles together?

#### Slide 9 -Open question

note 7.2
a triangle has:
- 3 vertices
- total of all angles = 180°
-3 sides

( have room for a few notes  + drawings in your notebook)

#### Slide 10 -Slide

special triangle 1
isosceles triangle

- two legs of the same length and one base
- two base angles and one vertex angle
- two angles with the same degree

#### Slide 11 -Slide

which side is the base
A
AB
B
BC
C
AC

#### Slide 12 -Quiz

special triangle 2
equilateral triangle

- all angles are the same size

- all sides are the same length

#### Slide 13 -Slide

how many degrees is each angle
A
45
B
60
C
90
D
180

#### Slide 14 -Quiz

special triangle 3
right-angled triangle

- has 1 angle of 90°

#### Slide 15 -Slide

right angled isosceles triangle
- right angle
- two legs of the same length
-

#### Slide 16 -Slide

special triangle ( 4 )
mother.           +            father                =         child
(isoscles)                       (right-angled).           ( isoscles                                                                            right-angled)

#### Slide 17 -Slide

a 90° angle
2 legs of the same length
all angles are of the same degree
has a base

#### Slide 18 -Drag question

homework
-exercise 11
- exercise 13
-exercise 14

on page 54 of book part 2

OR use the exercises in Classroom