John's Scribe Post Part 2

So the second part is the cylinder on page 31 were we had to calculate the area so in the picture below shows you the Diameter and radius:
This is what the cylinder looks like spread out, this is the out side of the cylinder.

This is the inside of the cylinder.

Then Mr.Backe wrote this down 

2(pie r² big-pie r² small)

 2(pie 10² - pie 5²)

                                                                                  2(pie 5²)
                                                                                  2(pie)(25) 

                                                                                  = 157.1

so thats it I think if anything is wrong tell me because I have to fix it.

Homework is TUTPUP, Apply and Practise 4-9 

-John! and I pick Paulo for the next scribepost.

John's Scribe Post for October 4th, 2010

Sup guys so today in math class Mr.Backe asked us if we did Check Your Understanding on page 31. No one did it so we did the problem together. First Mr.Backe drew the cake like this one:

So Mr.Backe told us to draw the top view. Then he asked me what happens to the circle on top. So I said that it blends in with the square part of the cake.

Then we had to draw the side view which is the one you see in the bottom picture:

So the reason why I have 20 cm d is because to find the circumference you need Pie D(diameter)

so to get the surface area Mr.Backe wrote the answer down so here it is:

S.A.= 25²+5 pie 20+4(25)(5)

       = 625 + 314.2 + 500

       = 1439.2 cm²

 

 

 

 

 

Finding the suface area for the check your understanding.

So now we have the pool stairs and all the dimensions with.As it is shown in the picture below the side is sort of not a shape.We have a way to find the area of that.Cut the little edege off.Now we have 20 x 30, and for the rest of that object(the big piece) 40 x 60 because 30 is cut off from 90.We square it because there is two of these objects.Then we add the rest.80 x (40 + 60 + 20 + 30 +20).So the formula is:
2{20 x 30 + 60 x 40 } + 80 (40 + 60 + 20 + 30 + 20)
2(600) + (2400) +80 (170)
2(3000)+13600
6000+13600
19600 cm squared.



Now for the house that everyone has a hard time with. Before I start this you have to know that the bottom is something that you do not need fo this part. It isn't visable and pressed against something so we can't use it.Now for the triangles it is base x hieght divided by 2.Then we square it.Then we find the area for the rectangle and add the rest which is timesed by 10.
Here is how it is written:
2{4 x 6 divided by 2 + 5x6 } + 10(5+5+5+5)
2(12) + (30) + 10 (20)
2(42)+200
84+200
284 m squared
The next scriber is John.Good luck mister president.

Deniel's Scribe post for September 29th

Hey guys so today in class Day 5 Period 5, Mr. Baké told us a question that everyone was struggling with so here is the question:

[ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ][ ]

What is the difference between an oblique and a diagonal?

So here's my solution on how i figured out this question,

In my opinion an Oblique line and a diagonal are both similar to each other because

A Diagonal line joins a two non-adjacent vertice's of a polygon

An Oblique line of symmetry is a slanted line rather then horizontal or vertical.

-_-_--_-_--_-_--_-_--_-_--_-_--_-_--_-_--_-_--_-_--_-_--_-_--_-_--_-_--_-_--_-_--_-_--_-_-

After Mr. Baké told us it was homework he handed out our tests back and reviewed over all the questions on the Symmetry test so here are the answers if u guys didn't know:

1. In the figure, the dashed line represents:

C.An oblique line of symmetry

2. In the design below, the dashed line represents:

A. A horizontal line of symmetry

3.What is the angle of rotation in the figure?

B. 60 degrees

4. The image shown below is the flag of Canada. The flag shows:

D. A vertical line of symmetry

5. The design has rotation symmetry. What is the angle of rotation of the design?

A. 15 degrees because it has 24 points divide 360 by 24 and you get 15 degrees.

6.The following figure demonstrates a picture with Q's that are differently placed:

B. It has a lack of symmetry

7. Figure 2 results from:

A. It is a reflection of Figure 1 about the y-axis

8. How many lines of symmetry does the figure have?

D. 6 because it is an octagon

9. The word bid is an example of a word:

This question got really confusing when people did there test because a lot of people thought the word bid was gonna be a defining word but it was wrong, it is a part of line symmetry and the line symmetry it has is with a vertical line of symmetry.

10.What is the order of rotation for the figure?

D. 6, because it has 6 sides

11. What type of symmetry is shown by the playing card?

C. It only has rotation symmetry

12. The playing card shows an example of

B. it also has rotation symmetry

13. Oblique line of symmetry

14.Vertical line of symmetry

15.Line of reflection or Line of symmetry

16.Mirror Line

17.Horizontal line of symmetry

19. The half figure of your shape has lines of symmetry , a vertical line of symmetry, horizontal line of symmetry, oblique line of symmetry, and Rotation Symmetry

20. You were suppose to rotate your image using the origin as the rotation center 180 degrees.

Also stating the coordinates of the rotated points.

So as for now here are the coordinates for u guys to make the shape :)

A (8,6) turns into (-8,-6) D (7,3) turns into (-7,-3)

B (2,8) turns into (-2,-8) E (7,5) turns into (-7,-5)

C (5,3) turns into (-5,3) F (8,5) turns into (-8,-5)

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

So after we reviewed our Symmetry test mostly everyone started to talk and chat and some did their work but homework was the Show you know on Pages 29-31 and including the Check Your Understanding

And also play:

The next scribe I choose is .................. uhmmm RUEBEN!! >:)

Kenneth's Scribepost for September 28

Hi guys, Today In Math class Day 4 Period 1, Mr.Backe showed us a formula for a cube.

The Formula for the Area of a Cube is 6s (squared).

Mr.Backe also wanted to tell us how we are going to find the Surface Area of a cylinder.

So We talked to each other about what the formula is, and the Surface Area for the cylinder was

S.A. Cylinder: 2 pie r (squared) + 2 pie r (height).

On the Board Mr.Backe used an isometric grid and was drawing a shape like this:

and he was putting numbers on the shape like this:

He also said that "How do I find the answer for x"

then mr.backe gave us the answer or actually we went along with him I think so that we get the answer together. And the answer Is:

x+2=5

x=5-2

x=3

Same thing for Y and eventually we followed Backe and got the answer together or so I think.

Anyways the answer was:

y+2=4

y=4-2

y=2

I want uhh umm uhhhh <.<>.> uhhh Deniel For next scribe

Tell me If I missed anything xD

Surface Area Scribe Post

Hi everyone. On Friday our test was canceled so we learned about finding the surface area of a Rectangular prism, which has length, width, as well as height.

Now. Here is a rectangular Prism, with some random numbers. Today the unit I am going to use is centimeters.

The length is 2 cm, the width is 5cm, and the height is 3 cm.

Formula: 2(lw)+2(lh)+2(wh)
2(2cm x 5cm) = 20, 2(2cm x 3cm) = 12, 2(5cm x 3cm) = 30cm
20+12+30 = 62
Our surface area is 62 cm2

If my answer is wrong, please correct me. Basically, all I did was follow the formula. Thanks for reading. And don't forget to study for the test we have on symmetry tomorrow.

Person I am choosing to scribe next: KENNY

Celdrick's Scribepost For September 23

Today in class, we played the card game for atleast 5 minutes and we did multiplying.
After that we had to figure out what was the order of rotation of a cube. Most of us said that the rotation of a cube has 4,8,16, and 24. One of the answer is right but we just didn't know how to explain it. So when Mr.B told us the answer...we all figured out how the answer is 8. So I'm gonna show you how its 8.






You can rotate the cube going to the right.So the cube can be rotated 4 times.











Then we have to rotate 4 times going up.



So 4+4=8 but we don't really know if we can rotate it in a different way...



Next...we had to figure out how many lines of symmetry there are in a cube. The answer is 12 and I'll show you how we got it. Since there's 4 lines of symmetries in a square...all you have to do is multiply it by 3 because of the front and back (1st group) the sides (2nd group) and top and bottom (3rd group) so there are 12 lines of symmetries in a cube.



The last thing we did was to figure out the surface area of a cube.
The formula is bxhx6.
The net was something like this.




All sides are 3 cm because all sides are equal.










So the answer is:






Sorry my computer won't let me add colour so yea....hope you liked it and don't forget your homework......


The next person I choose to do the scribe is.ASHAM......


peace!!!!!!!





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