1TH/Vwo §4.5 Drawing angles PTI 180324

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 1

§ 4.5 Drawing angles

+  Before doing § 4.5,

     you will PRACTICE § 4.4 Measuring angles once more!

+ Note for next lessons: always bring your 

    GEO TRIANGLE + COMPASSES!

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

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!)

 (3):

6. Exchange your Notebook with your neighbour

7.  Measure your neighbour's two angles

8. Write both results next to the angles

                        (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?!

                        (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?!

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. 

Now it's your turn to try it out!

Do § 4.5 Drawing angles.

Start with exercise 34, skipping 33.

In short time we will look at:

 DRAWING a TRIANGLE. 

For doing exercises 35 utai 39.

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!

Explanation number 2:

If the Movie wasn't clear to you, then the book might be better for  you:

on p.140 the DRAWING of a TRIANGLE  is also explained!

STUDY this carefully, before doing exercise 36 and further!

Next slides show it to you.

Homework Time:

+  Make and correct ex. 34, 35 utai 39.

    

+ Note for next lesson: bring your COMPASSES! (=passer)