Scribe May 21

SCRIBE

Um hello... in class on Friday we learned more things about circles. Chord Properties to be exact. There are four steps to find the interscection of the arcs... Heres a summary of the things we leanred in class recently.


1) You make a chord on the circle.

2)Widen your compass pass ther half way point of your line.

3)Place compass point on each end of the line. Make arcs above and below the line.

4) Then draw lines through the intersection of the arcs and the center point of the circle.( sorry the line that intersects the arcs were suppose to be straight not slanted like this...)

Then heres an example of a question we did, based on the circle we have drawn. We were given that the Chored is 2x and we needed to find the radius of the circle.

Then after he gave us another question. We had to find the length of CD if CB is 2x+2. To do that we need to do pythagras and use the information he gave us. if CB is 2x+2 and AD which is equal to BD then that means the side is x.
Here's how you solve it.

Well... this is it... the homework is 10.2.

extra practise

Workbook

mental Math

In the workbook its...

CYU 1 and 2 (pg.389)

Practise and 2

Apply odd

Extend all

Scribepost

March 5,2010

Okay, on Friday, we didn't learn exactly anything new but we did went over a question. We also got a TON of blue papers for chapter 7. There is really nothing new to say exept for the homeworks...

The main homework that should be done BY Monday is the stash it..which is the...
Foldable
Self assessment
Challenges (one of the two..which are kayaks for rent or what have you got to hide)
The mathlinks
Signed test

Then the homework that should be "considered homework" is...
Daffynition Decoder
7-3 and 7-4(green booklet)
7.1 extra practise and work book
7.2 extra practise and work book

Well that's all that I got to say... for my scribe...

the next scribe is...
MARC!

please comment....

Math Game-Teleporter Galaxy

Teleporter Galaxy

Instructions and Rules of Teleporter Galaxy:

1) 2 or 4 players can play this game. If 4 players are playing, split into two teams.

2) First player rolls the dice and goes forward.

3) Look at the colour you landed on and take a card from the same colour deck.

4) Answer the question without your teammate's help. You're allowed to use a calculator or do it on paper.

5) If you got it right, move one step forward. If not, stay.

6) Take turns doing this.

7) If you land on BONUS (the black triangle) take a card from the black deck. First team to answer correctly gets to switch spots with opposing team if the opposing team is ahead. If they aren't, move 3 spaces up.

8) If your teammate finishes first, they will be allowed to help you on the question.

9) First team to have both players around the star wins.

Mr.Backe

Happy Holidays! Mr.Backe thank you for teaching us math this year and also im look forward to next year! Thank you for the time after school to teach me stuff that I dont know and don't get until like you explained it to me like 4 times! Your like the best math teacher I ever had. When you were gone it wasn't the same. No one was there to make fun of people and scold us because we got things wrong.

oh I have this video that is kinda about math...I hope you dont get bored over the Chistmas break!

I hope you have a merry christmas!^^

Scribe for December 4,2009

Scribe

Hey 9-05! I'm sorry that this scribe post is late! Also I will make this scribe post kinda short.... Well, on friday's math class we reviewed our Thursday's homework. (CYU) Like...this question...

(sorry that it's blurry...) Well do you remember this question? The one you have to find which square root number is between 4.5 and 5.5?

Then thats what we did for like half of the class. Corrections. Then we had MORE homework to do. (by now you should be finished...)They were...

-Do 2.4 practise

-Apply do 3 of 15-19

do 7 of 20-30

-Extend 4 of the 5

If you could...do the worksheet 2.4 and the homework book 2.4

One of the 2.4 practise was this one...

...Well that's all for this post...see ya

PS next scribe post is....ALEIAH

question chessboard

Hi! I'm SO SORRY that this is REALLY late. I hope that I explain this question well. The Question I got is the chessboard question. THe first question talks about the diagonal lines of the small squares/rectangles.

A)Find the diagonal of all squares and rectanges possible in the first three rows. Then Arrange the squares/rectangles, from least to greatest by length of their diagonals.

As you can see, not all the little squares were "counted" because for example, row 3 and column 1 was already done by the first row, third column.(Do you get it?)
Now we need to find ALL the possible diagonals in the first three rows.
If it helps you draw a picture of the chess board and then do the math.

The picture(sorry that it's a bit blurry)on the bottom shows all the possible diagonal lines. IN ORDER from LEAST TO GREATEST

In order to get the diagonal of the squares/rectangle, you need to know that A squared + B squared = C squared (formula for a triangle)

The second part of this question is...

B) Consider the entire chessboard. When would you expect the square or rectangle to give a whole number diagonal?

The picture below shows how many squares/rectangles that give a whole number. When we did the three rows, we only found one.

Which was 3 squared + 4 squared = C squared

Then the square root of 10 = C squared

Then the answer was 5 = C squared

Then there's another diagonal with a whole number which was:

6 squared +8 squared = C squared

square root of 100 = C squared

Then you get the answer of 10 = C squared

If you look at the two diagonals that have a whole number as a diagonal, you could see that

6 squared +8 squared is four times as much as 3 squared + 4 squared. I don't really know how else I could explain part B of this question....so that's all I'm going to say...

Question #18

QUESTION 18


Hi everyone! Well for the text book questions I got question 18!(yay) So Ill go straight to the point! The question was...

Determine the mean of each set of numbers. Express your answer to the nearest hundreth, if necessary.

Okay here's how you do this. First you add all the numberes up.(you can put it in order of you want but we're doing the mean so that doesn't really matter, but it's good if you do put it in order) Then you count the number of numbers.(Sorry if im not to clear on this...) Then the sum of all the numbers divided by the numbers of numbers you counted equals the mean.

Okay here's question 18 A)


And Question 18 B)




Well thats everything...sorry if I didn't explain really clearly...(I tried)

SEE YOU GUYS SOON! ^_^

October 9,2009

Scribe

Hiya! Today in class we did things like reviewing the cylinder question! So I'm going to explain that to you all...I mean review it to you guys by using pictures.

As you know, we had to find the surface area of the cylinder. Well to do that you need to find the surface area of the big cylinder and then the little cylinder. After you have to take the area of the small circles and take away from the big one because the area of the small circle doesn't exist! then add the surface area of the big cylinder and the surface area of the small cylinder. So this is what we did in class...

After as I said we add the surfaces areas together like this...

628+188-25

=816-25
=791u2

Then that means the total is 791 units squared...Um do you get it?

After we reviewed the cylinder question in class, we also went through the blocks that we got for homework. You know the one we had to make a net..I think and find the surface area? This is one of the shapes that is broken into two parts so we can figure the surface area out easier.

SA for shape one= 2 (LH)+ 2 (LW)+ 2 (WH)

= 2(4)(2)+2(4)(1)+2(1)(2)

=16+8+4

=28

SA for shape two= 2(LH)+ 2(LW)+ 2(WH)

=2(4)(1)+2(4)(1)+2(1)(1)

=8+8+2

=18

Because two faces are touching...we need to subtract that from the total surface area...

2(1)(4)

=8

=28h8-8

=38u

Finally, you know that new shape that he showed us and told us the easy way to find the surface area for it?well here it is!(sorry if it doesn't look like it...)

Okay, you know that the front view has 4 units. You times that by two to get sixteen because the bottom is the same thing(sorry for not drawing that)That also goes the same for the top view. Then in the top view, there are 4 units then same thing,you times that by two to get eight.

okay for homework we still have to do the textbook work....I dont really know which onces there are...forgive me...

Well thats all I can remember from todays class...I hope you understand...please comment. For the next scribe Im choosing randomly so I choose Jai.(dont get mad at me...)

Why 360?

Why 360?

Well long, long, long ago, before we were born the Sumerians, then later the Babylonians had a number system called sexagesimal. (you can call it as a base of 60 numeral system)Instead of our numeral system base 10, they used base 60. Now why 360? Well, did you notice that the number of days in a year,365 is close to 360? The Babylonians noticed that celestial pole moved everyday; about one degree of a circle(1/360). So they used 360 in their calander then 365 like ours. So maybe thats why they chose 360.

Oh! also its because it has so many divisible numbers! In fact 24 divisors!(isn't that a lot?)

360 is divisible by...

1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120, 180, and 360.