3Thavo Ch8 or Ch10: REFRESH

• Wiskunde
• Middelbare school
• havo
• Leerjaar 3

Welcome ...

+ to this first Long distance Math Lesson

+ Thanks to the technical developments you can work on ...

+ by yourself, but also a bit together,

+ starting right now with this LessonUp!

Homework :

Math A: Ch 8  REFRESH    p.8/9

Math B: Ch 10 Refresh    p.82/83

Before you do this §, we will look at a few fine points.

We start with a short intro for the Math B pupils.

If you do Math A, please follow this too. 

It does not take long and you are ready when 'your slides' start.

Make sure you use the right materials (that you cannot forget now, being at home!):

+ pencil

+ pair of compasses

+ geo triangle

Question about these triangles on next slide!

Which statement is true?

1. A right-angled triangle can have an obtuse angle too.
2. An acute-angled triangle has 3 acute angles.
3. An obtuse-angled triangle has only one obtuse angle.
4. A triangle can be right-angled and obtuse-angled at the same time.

Math B students,

Good luck working out Ch 10 Refresh, p.82/83.

Now Math A's slides, about Refresh Ch 8, p.8/9, start!

Draw that 'frequency polygon', it says in R1b.

But ...

What is a frequency polygon ?!

What is a frequency polygon?

1. a kinda bar chart
2. a line that joins points from a table, in a graph
3. a graph, mostly time is included
4. has to do with 'News on Polygon'

frequency polygon:

one more time 'frequency polygon', 

going into the WORDS:

+ frequency: how often (frequent) something happens

+ polygon: a line drawn through points, taken from 

      a table

Calculating percentages:

a FreshenUp in a LessonUp

see next slide!

But ... it doesn't mean a thing, without some examples!

First with a 'ratio table'. Then with a 'factor'.

In R3d you are asked to make a 

frequency table ?!

Frequency table - an example:

Homework time.

+ Good luck doing REFRESH Ch8 or Ch 10.

+ When you are stuck and the Solutionsbook is not clear enough for you,

+ you may mail me and I will provide you with an explanation.

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