# 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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Slide 1: Slide
WiskundeMiddelbare schoolvwoLeerjaar 1

This lesson contains 17 slides, with text slides and 2 videos.

Lesson duration is: 50 min

## Items in this lesson

§ 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:
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

#### Slide 3 -Slide

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

#### Slide 4 -Slide

(4)

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)

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 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 9 -Video

Now it's your turn to try it out!
Do § 4.5 Drawing angles, p.144-147
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 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 16 -Slide

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