# 1TH/Vwo §5.4 Measuring angles

§5.4 Measuring angles ...

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Slide 1: Slide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

This lesson contains 17 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

## Items in this lesson

§5.4 Measuring angles ...

#### Slide 1 -Slide

1TH/Vwo §5.4 Measuring angles

First a quick check on your knowledge of §5.3 !
Try to give the good answers, gaining points.

#### Slide 2 -Slide

an angle of 90 degrees is a(n) ...
A
straight angle
B
obtuse angle
C
right angle
D
acute angle

#### Slide 3 -Quiz

An angle of 47 degrees is a(n)
...... angle.
A
obtuse
B
right
C
acute
D
straight

#### Slide 4 -Quiz

An obtuse angle could be ...
A
99 degrees
B
36 degrees
C
90 degrees
D
180 degrees

#### Slide 5 -Quiz

I wonder if    .....
+ you had both wrong, having no clue
However, let's look back at the Theory from §5.3 !

#### Slide 9 -Slide

Attention (1):
+ a right angle has :
+ an acute angle has a number of degrees between  0  and  90.
90°

#### Slide 12 -Slide

Attenzione (2):
+ an obtuse angles has a number of degrees between 90 and 180
+ a straight angle has 180 degrees

#### Slide 13 -Slide

Soon comes a Movie.

#### Slide 14 -Slide

First 2 special things:

+  Which angle is meant?
+ How to measure an angle if the arms are too short?
Just watch the next slides!

#### Slide 15 -Slide

In the picture you see many different angles:
+ angles A, C and E , but also
+ angles B1, B2, D1 and D2 !
+ so by the added number you
know which part of the angle
is meant. Great!

#### Slide 16 -Slide

If the arms of an angle are too short, just ....
extend them!
So in this case