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1TH/Vwo §4.4 Measuring angles
§4.4 Measuring angles ...
is on the menu today!
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Slide 1:
Slide
Wiskunde
Middelbare school
havo, vwo
Leerjaar 1
This lesson contains
26 slides
, with
interactive quizzes
,
text slides
and
1 video
.
Lesson duration is:
50 min
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Items in this lesson
§4.4 Measuring angles ...
is on the menu today!
Slide 1 - Slide
At the very first ...
Your teacher will demonstrate how to MEASURE angles
with a GEO triangle.
Slide 2 - Slide
1TH/Vwo §4.4 Measuring angles
First a quick check on your knowledge of §5.3 !
Try to give the good answers, gaining points.
Slide 3 - Slide
an angle of 90 degrees is a(n) ...
A
straight angle
B
obtuse angle
C
right angle
D
acute angle
Slide 4 - Quiz
An angle of 47 degrees is a(n)
...... angle.
A
obtuse
B
right
C
acute
D
straight
Slide 5 - Quiz
An obtuse angle could be ...
A
99 degrees
B
36 degrees
C
90 degrees
D
180 degrees
Slide 6 - Quiz
I wonder if .....
+ you had all questions right, knowing all about it, or
+ you had both wrong, having no clue
However, let's look back at the Theory from §4.3 !
Slide 7 - Slide
Slide 8 - Slide
Slide 9 - Slide
Slide 10 - Slide
Attention (1):
+ a right angle has :
+ an acute angle has a number of degrees between 0 and 90.
9
0
°
Slide 11 - Slide
Slide 12 - Slide
Slide 13 - Slide
Attenzione (2):
+ an obtuse angles has a number of degrees between 90 and 180
+ a straight angle has 180 degrees
Slide 14 - Slide
Ready for §4.4 Measuring angles?
Soon comes a Movie.
Slide 15 - Slide
Measuring angles ...
+ you can do with the GEO TRIANGLE:
using the PROTRACTOR ( =gradenboog) on it
+ that's the semi-circle (=half a circle) with the degrees from 0 - 180 degrees
written on it
+ just watch the following Movie and be amazed!
Slide 16 - Slide
Ruben ...
surely knows how to explain things in a simple way!
By the way, I offer you this Dutch movie, because it was the only one I found that used a Geo triangle and not a compass rose!
Slide 17 - Slide
Slide 18 - Video
Slide 19 - Slide
Slide 20 - Slide
Slide 21 - 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 22 - Slide
If the arms of an angle are too short, just ....
extend them!
So in this case
you take your pencil and
make both arms longer,
so that the geo can be used well!
(You may even do this in your Textbook,
but with a PENCIL, of course!)
Slide 23 - Slide
Slide 24 - 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 25 - Slide
Time for Homework
+ Do: § 4.4 Measuring angles
+ Check your work with the Solutionsbook
+ take pics and
+ send in all the stuff on Google Classroom
Slide 26 - Slide
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