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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:
Tekstslide
Wiskunde
Middelbare school
havo, vwo
Leerjaar 1
In deze les zitten
32 slides
, met
interactieve quizzen
,
tekstslides
en
1 video
.
Lesduur is:
50 min
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§4.4 Measuring angles ...
is on the menu today!
Slide 1 - Tekstslide
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 2 - Tekstslide
an angle of 90 degrees is a(n) ...
A
straight angle
B
obtuse angle
C
right angle
D
acute angle
Slide 3 - Quizvraag
An angle of 47 degrees is a(n)
...... angle.
A
obtuse
B
right
C
acute
D
straight
Slide 4 - Quizvraag
An obtuse angle could be ...
A
99 degrees
B
36 degrees
C
90 degrees
D
180 degrees
Slide 5 - Quizvraag
an angle of 103 degrees is a(n)
angle
A
acute
B
right
C
obtuse
D
straight
Slide 6 - Quizvraag
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 - Tekstslide
Slide 8 - Tekstslide
Slide 9 - Tekstslide
Slide 10 - Tekstslide
Attention (1):
+ a right angle has :
+ an acute angle has a number of degrees between 0 and 90.
9
0
°
Slide 11 - Tekstslide
Slide 12 - Tekstslide
Slide 13 - Tekstslide
Attenzione (2):
+ an obtuse angles has a number of degrees between 90 and 180
+ a straight angle has 180 degrees
Slide 14 - Tekstslide
Slide 15 - Tekstslide
Slide 16 - Tekstslide
Ready for §4.4 Measuring angles?
Soon comes a Movie.
Slide 17 - Tekstslide
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 18 - Tekstslide
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 19 - Tekstslide
Slide 20 - Video
Now...
Your teacher will demonstrate how to MEASURE angles
with a GEO triangle.
After this Ruben will take over!
(But who the heck is Ruben?!)
Slide 21 - Tekstslide
Slide 22 - Tekstslide
How many degrees is angle P?
First notice this:
+ the 0-point of the GEO lies on the vertex of the angle
+ the longest side of the GEO lies along one of the arms of the angle
Slide 23 - Tekstslide
How many degrees is angle P?
There are two possible answers:
We read off 64 degrees and also 116 degrees.
Is this angle acute or obtuse? It's acute because it lies between
0 and 90 degrees.
So 64 degrees is the good answer!
Slide 24 - Tekstslide
Slide 25 - Tekstslide
Homework time
Make the tasks.
Correct them with the Solutionsbook.
Later a few more slides follow.
Good luck!
timer
15:00
Slide 26 - Tekstslide
3 special things:
+ A difficult word for your wordlist
+ Which angle is meant?
+ How to measure an angle if the arms are too short?
Just watch the next slides!
Slide 27 - Tekstslide
Please add to the Wordlist:
an AUXILIARY line - een hulplijn
in opposite directions - in tegengestelde richtingen
a pentagon - een vijfhoek
a hexagon - een zeshoek
Slide 28 - Tekstslide
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 29 - Tekstslide
Slide 30 - Tekstslide
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 31 - Tekstslide
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 32 - Tekstslide
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