3Thavo §8.3 (A) and §10.3 (B)

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This lesson contains 23 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 50 min

Items in this lesson

good morning

Slide 1 - Slide

 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!

Slide 2 - Slide

After the perpendicular bisector (§10.1),
altitude (§10.2) it is now time for:
Do the 
Challenge path
again!

Slide 3 - Slide

Slide 4 - Slide

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

Slide 5 - Slide

Which does not belong in the list?
(WHY NOT?)
A
angle bisector
B
perpendicular bisector
C
diagonal
D
altitude

Slide 6 - Quiz

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!

Slide 7 - Slide

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

Slide 8 - Slide

Compasses you need for drawing .....
A
triangle, knowing lengths sides
B
the PB
C
triangle, knowing angles
D
the point of intersection of the 3 PB's in a triangle

Slide 9 - Quiz

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 .....' !

Slide 10 - Slide

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!

Slide 11 - Slide



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.

Slide 12 - Slide

Slide 13 - Slide

The statement below is the final new thing of this § !
Good luck doing the job!
High time for Math A pupils, doing §8.3 !

Slide 14 - Slide

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

Slide 15 - Slide

'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. 

Slide 16 - Slide

Slide 17 - Slide

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

Slide 18 - Slide

The difference as 'temperature progression' is
concerned is ........
A
A'dam: temperature differs 19-2 = 17 degrees only, 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

Slide 19 - Quiz

 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!

Slide 20 - Slide

Slide 21 - Slide

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

Slide 22 - Slide

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.


Slide 23 - Slide