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1TH/Vwo §4.5 Drawing angles
§ 4.5 Drawing angles
+ Before doing § 4.5,
you will PRACTICE § 4.4 Measuring angles once more!
+ Note for next lessons: always your
GEO TRIANGLE + COMPASSES!
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Wiskunde
Middelbare school
vwo
Leerjaar 1
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Lesson duration is:
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§ 4.5 Drawing angles
+ Before doing § 4.5,
you will PRACTICE § 4.4 Measuring angles once more!
+ Note for next lessons: always your
GEO TRIANGLE + COMPASSES!
Slide 1 - Slide
Practising measuring angles, in pairs (1).
Step by step:
1. Open your Notebook
2. Take your GEO TRIANGLE and a PENCIL from your pencil case
3. Draw an ACUTE ANGLE and an OBTUSE ANGLE in your Notebook
Slide 2 - Slide
Practising measuring angles (2)
4. Measure both angles with your geo triangle
5. Write your two results at the BACK of the page
(so: seperate from your angles!)
Slide 3 - Slide
(3):
6. Exchange your Notebook with your neighbour
7. Measure your neighbour's two angles
8. Write both results next to the angles
Slide 4 - Slide
(4)
9. Now COMPARE your own results to your neighbour's!
10. Exchange back your Notebooks
11. Discuss shortly: are your measurements equal or not?
If the difference is more than 2 degrees, measure again to see who's right!
12. However, if the difference is enormous, what will be the reason then?!
Slide 5 - Slide
(5)
10. Exchange back your Notebooks
11. Discuss shortly: are your measurements equal or not?
If the difference is more than 2 degrees, measure again to see who's right!
12. However, if the difference is enormous, what will be the reason then?!
Slide 6 - Slide
Slide 7 - Slide
Drawing angles
When drawing angles don't forget to include an ARC (boogje) to indicate which angle you mean and to LABEL the angle with a CAPITAL LETTER.
Next comes up a dutch Movie.
It's the only movie I found in which a geo triangle was used.
Other films used a compass rose.
A compass rose is included in your textbook, but we don't use it.
Slide 8 - Slide
Slide 9 - Video
Now it's your turn to try it out!
Do § 4.5 Drawing angles, p.144-147
Start with exercise 34, skipping 33.
In short time we will look at:
DRAWING a TRIANGLE.
For doing exercises 36. t/m. 39.
Slide 10 - Slide
Drawing triangles - a MOVIE.
How to draw a triangle?
This movie demonstrates it in a clear way.
The teacher first makes a rough sketch.
Only then he makes the precise triangle!
Slide 11 - Slide
Slide 12 - Video
Explanation number 2:
If the Movie wasn't clear to you, then the book might be better for you:
on p.145 the DRAWING of a TRIANGLE is also explained!
STUDY this carefully, before doing exercise 36 and further!
Next slides show it to you.
Slide 13 - Slide
Slide 14 - Slide
Slide 15 - Slide
Slide 16 - Slide
Homework Time:
+ Make, correct, take pics and hand in, in GC:
§4.5 Drawing angles.
+ Note for next lesson: bring your COMPASSES!
Slide 17 - Slide
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