7.2 special triangles

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 1

program

- get notebook

-get iPad FLAT on your table during the lesson

-note about triangles

- exercises

lessonUp

go to ''lesson up app'' in google

login using the code on the bottom left

triangles
what do you already know

triangles

tri  means three

angle means angle

together triangle

what is the sum of the three angles together?

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)

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

which side is the base

1. AB
2. BC
3. AC

special triangle 2

equilateral triangle

- all angles are the same size

- all sides are the same length 

how many degrees is each angle

1. 45
2. 60
3. 90
4. 180

special triangle 3

right-angled triangle

- has 1 angle of 90°

right angled isosceles triangle

- right angle

- two legs of the same length

-

special triangle ( 4 )

mother.           +            father                =         child

(isoscles)                       (right-angled).           ( isoscles                                                                            right-angled) 

a 90° angle

2 legs of the same length

all angles are of the same degree

has a base

homework

-exercise 11 

- exercise 13

-exercise 14

on page 54 of book part 2

OR use the exercises in Classroom