## Monday, April 12, 2010

### Areas and Integers

Areas:
I am creating two circular flower beds in my front yard. The first flower bed has a diameter of 12m and the second one has a radius of 8m. My front yard is 20m wide and 30m long. The rest of the front yard is grass will I have to cut?

r=d/2
r=12/2
r=6

Area of a circle:
A=pi r squared
A=3.14 multiplied by 6m squared
A=3.14 multiplied by 36
A=113.04m squared

Area of a circle:
A=pi r squared
A=3.14 multiplied by 8m squared
A=3.14 multiplied by 64
A=200.96m squared

Area of a rectangle:
A=b multiplied by height
A=30 multiplied by 20
A=600m squared

113.04m squared + A=200.96m squared= 314m squared

600m squared - 314m squared= 286m squared

You would have to cut 286m squared of grass.

You have a triangular shaped yard with a base of 10m and a height of 15m. You are creating a sand box for your kids. The sandbox has a circumference of 6.28m. How much yard do you have left.

C=pi d
C=2 pi r
6.28=2 (3.14) r
6.28/6.28= 6.28r/6.28
1=1r
1m=r

Area of a circle:
A=pi r squared
A=3.14 multiplied by 1m squared
A=3.14 multiplied by 1
A=3.14m squared

Area of a triangle:
A=b multiplied by height/2
A=10 multiplied 15/2
A=150/2
A=75m squared

75m squared - 3.14m squared= 71.86m squared

You would have 71.86m squared of yard left.

Integers:

Integers are positive and negative whole numbers and zero.

eg.2, -6, 91, +103, -1000, 0.
not integers: -3/4, +1/2, 4/5, 0.1, -0.7, 91.3, 1.3, 95%, -60%.

Integers can be shown on a number line or using integer chips.

BLUE CHIPS= negative numbers RED CHIPS= positive numbers

000 = -3

000= +3

Homework:

Identify each integer

a) 0 b) 0 c)000 d)00000 e)0000000 f)00000

Represent each integer:

+2, 8, -4, +7, -6, -8.

Here is a link for a video. I went on YouTube to find a video and there was no place that even shows the embed so I had to post the link. Sorry for the inconvenience. http://www.youtube.com/watch?v=SZf2UUsMhfI&feature=PlayList&p=3A35B91F32C28418&playnext_from=PL&playnext=1&index=47

1. Good job.Emily you did a great job on your blog and explaining integers.You put a video and picture.But you could have put some more fonts to make it colourful.But it was still a good job.

2. Great job Emily. It looks very neat and organized. you could have put more colors to it to make it better. Other than that great job.

3. Good jod Emily! It looks very nice and organized but for some reason the link didnt work for me,but other then that u did great!

4. You did a good job on the post Emily ! i like how you used different colored fonts to make some words stand out.

5. Nice post Emily! The scribe is very organized and neat. Also I really liked how you used different colors for some of the words.

6. Great post, Emily! Your scribe looks very organized and neat. I really liked how you used different colors.

7. great post Emily. Its very neat and well organized and you made words stand out by putting different colors.

8. Thanks for commenting. I'm sorry if the link didn't work.

9. Great job emily everything was well organized but you could've changed some colors for the important words so it's more easier to know them but everything else was great.

10. Great post, Emily! Everything is well organized and the pictures really helped. I also liked how you changed the colors of the font to make it stand out.

11. Great Post Emily. I liked the Integer picture but next time I think that you should add the video not in a link.

12. Great job Emily. I like that your scribe was neat and organized. I also like when you changed the colours of the red and blue chips. Try to post the video on the scribe next time.

13. Good job Emily. I like how everything is very organized, but you put the video in a link.

14. Neat post, Emily! I like how it was organized. Next time, bold or change the colour of the important words.

15. Good job Emily Ii was very well done. Its okay if the link didn't work but next don't put a video to a link.

16. Great job. Great organization but to bad the link did not work and add a bit more colour.

17. The lind didn't work but on the other hand it was a job well done.

18. Nice post, add a little bit more color though

19. Good job, but you should add more colour, so it wont look so plain but everything was well organized.

20. Nice post Emily, try to add a video next time.

21. Nice post, Emily. I really liked how organized it was, but a little more color would make it a lot more eye catching.

22. Nice post, you could have tried to find another video.

23. Nice job, try to add more colour.

24. Great job but next time add more colour!

25. good job Emily. but try to add more colour next time.