3Thavo §8.3 (A) and §10.3 (B)

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 3

good morning

 Homework:     Math A: §8.3 

                                          Math B: §10.3

First a few slides for Math B, in which we browse a little superficially (oppervlakkig) through the paragraph.

Math A pupils, follow these few slides too, please. Then you are ready for your slides, that follow soon!

After the perpendicular bisector (§10.1),

altitude (§10.2) it is now time for:

Do the 

Challenge path

again!

Question 1 (M.C.):

 (In the next slide you cannot see the options any more, so remember your choice!)

Which line does not belong in the coming list:

A.    Angle bisector

B.   Perpendicular bisector

C.   Diagonal

D.   Altitude

Which does not belong in the list?
(WHY NOT?)

1. angle bisector
2. perpendicular bisector
3. diagonal
4. altitude

Answer:

C.   diagonal.

because this line cannot be in a triangle!

Just have a try(angle), haha.

In a quadrilateral you might be more succesful!

Question 2: a pair of compasses you need for:

A. drawing a triangle when you know the lengths of the sides

B. drawing the perpendicular bisector (=PB)

C. drawing a triangle when you know the angles

D. drawing the point of intersection of the 3 PB's in a triangle

Compasses you need for drawing .....

1. triangle, knowing lengths sides
2. the PB
3. triangle, knowing angles
4. the point of intersection of the 3 PB's in a triangle

2 Mistakes below, that you may correct with a pencil:

1st 'b Plot ......'   should be:   'b Construct ......'  and

2nd 'c Also draw ....'  should be:  'c Also construct .....' !

If you wonder: What is he talking about? 'Constructing'??!

Constructing an angle bisector (with a pair of compasses!) is explained in the THEORY above this exercise, on p.93!

Mistake in drawing above: 

SX = SZ , it says, but this is clearly not true in the drawing! (SZ is longer)

Never mind, but let it just be said, that the drawing is not accurate.

The statement below is the final new thing of this § !

Good luck doing the job!

High time for Math A pupils, doing §8.3 !

Let's start with the Introduction of §8.3 Measure of spread!

'Measures of spread' is the paragraph's name.

Spread means 'spreiding', so:

how widely or closely together spread are the numbers?

The different ways of expressing this spread of data 

is dealt with in this paragraph. 

M.C. question, te be filled in, in next slide.

So: remember your choice!

The difference as 'temperature progression' (how it developes)

between Amsterdam and Irkutsk is:

A. A'dam differs only 19 - 2 = 17, but in Irkutsk 28 + 18 = 46 !

B. A'dam: big difference,   Irkutsk small difference

C. A'dam: all positive temperatures;  Irkutsk all negative temperatures

D. A'dam: small difference; Irkutsk: great difference

The difference as 'temperature progression' is
concerned is ........

1. A'dam: temperature differs 19-2 = 17 degrees only, but in Irkutsk: 28 + 18 = 46 !
2. A'dam: big difference Irkutsk: small difference
3. A'dam: all positive temperatures Irkutsk: all negative temperatures
4. A'dam: small difference Irkutsk: great difference

 Next comes a 'Theory' with some new words in it.

That makes it seem difficult. It's not.

It is about dividing up some numbers in 4 groups.

When you Study the Example that follows in the next slide -also on p.20- It will become clear, I am sure!

Here is the Example - if it is not clear yet now, it will be when you go through the paragraph, step by step!

Homework time.

Good luck, doing §10.3 Measures of spread.

Let me know if you need more explanation.

Do not forget to send me pictures of your homework.