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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§ 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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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

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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!)

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 (3):
6. Exchange your Notebook with your neighbour
7.  Measure your neighbour's two angles
8. Write both results next to the angles

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                        (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?!

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                        (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?!

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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.


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Slide 9 - Vidéo

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.

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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!

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Slide 12 - Vidéo

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.

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Homework Time:
+  Make, correct, take pics and hand in, in GC: 
     §4.5 Drawing angles.
+ Note for next lesson: bring your COMPASSES!

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