Monday, March 22, 2010

Area

Area - The space a shape takes up.
- Describe in square units 4cm2.

Review
Area of square or rectangle.









eg.










A = L x W
A = 6 x 2
A = 12cm2


Parallelogram:














eg.










A = bxh
A = 10 x 5
A = 50cm2

Finding Area of a circle.
Use pieces of circle to create to
a shape very close to a parallelogram.








Close to parallelogram.
h = radius of a circle
b = 1/2 circumference
Ap = b x h
Ao = 2 pi r/2 x r
Ao = pi x r x r
Ao = pi r 2


Find the area of a circle with a radius of 10m. Formula and work.
Ao = pi r 2
Ao = 3.14 x 10 2
Ao = 3.14 x 100
Ao = 314 m2

Find Area of following circles.








Answer for "8 cm":
Ao = pi r 2
Ao = 3.14 x 8 2
Ao = 3.14 x 64
Ao = 200.96cm 2

Answer for "14.8m":
Ao = pi r 2
Ao = 3.14 x 14.5 2
Ao = 3.14 x 219.64
Ao = 687.79cm 2










Answer for "6.8 m":
r = d/2
r = 6.8/2
r = 3.4

Ao = pi r 2
Ao = 3.14 x 3.4 2
Ao = 3.14 x 11.56
Ao = 36.30m 2

Answer for "20 cm":
r = d/2
r = 20/2

Ao = pi x 2
Ao = 3.14 x 10 2
Ao = 3.14 x 100
Ao = 314cm 2


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30 comments:

  1. This comment has been removed by the author.

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  2. I'm sorry that I leave out some spaces. I tried to fix it but it would end up all messed up so i didn't want you guys to get confused. I'll try to do better next time. Please ignore the spaces, thank you!

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  3. Great post, Raelynn! The pictures really helped me and I liked how you changed the font color. Amazing scribe!

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  4. Good job Raelynn! I really liked how you used different colors for some of the words and it's really organized.

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  5. Nice post Raelynn! I like how you use alot of pictures to help us understand your scribe but you should use a little darker colour because it seems like the words are blending in with the backround.But it was still a good post.

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  6. Nice post Realynn! It was well organized and helped me understand it better.

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  7. Great post Raelynn. I really like how it is neat and organized. It's very easy to understand. I also like the pictures that you made. Some of the colours of the words were a little bit distracting though. Other than that, great post.

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  8. Nice post Raelynn!!! It was organized and well written. But next time it might be better to not use as much different colours.

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  9. nice post Raelynn. Your post is very organized and its very colorful but next time don't use too much colors cause it's kind of distracting other than that great job!!

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  10. Nice post Raelynn ! It was organized. I really like the colours you added !

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  11. Great post Raelynn, I like how you made all of the pictures yourself and the video really helped!

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  12. Great post Raelynn the pictures really helped and some of the important letters really helped and the video was also great.

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  13. Great Post Raelynn. It looks really organized and heat but the colors are a little distracting like Kim said. Other than that, great job.

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  14. Excellent post, Raelynn! I really liked how it was organized. Though there were too many colours and what Kim said, it was a little distracting. Overall, it was a well done scribe post.

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  15. Good job Raelynn. There were lots of different colours though.

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  16. Hello my name is Bryce. I am one of the students from Zagreb. You explained the lesson very well and I can understand what your class is doing. However I believe that you could have explained the math a little bit more.
    Bryce comment 2

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  17. Hey, my name is Fabi. I think your blog post was great, because you included pictures and a video and plenty od explanantions. I also think it was very neat. At times your font was a little bit hard to read. Overall, though, super blog post

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  18. Great job Raelynn, your post was orginized and had a video, i think next time you should not use to many colors but other than that great job!

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  19. Great post. You remembered the link and video. Great job. I would be more attracted to the article if there was more colour, just a suggestion.

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  20. Nice post. I like the video and it help's alot. You could have put a link to a website though.

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  21. Great post Raelynn. I liked the colors you used. Next time you should put a video though. But overall nice work.

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  22. I really like your post good job

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  23. I like your post! Next time you should put a link on the video.

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  24. good post, next time u should add a video

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  25. Nice post Raelynn, it was very organized but try to add a video next time.

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  26. Nice post, Raelynne. I like the video you posted and I think your scribe is pretty neat, but you over did it with the color.

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  27. Nice post, but u could have added a link to a website.

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  28. Great post next time you should add more colour to it though!

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  29. Good post next time add more colour!

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