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Fri Jan 31, 2014, 06:49 PM

Math, possibly geometry?, question.

I am using a shape with my students that looks like a parallelogram, but the left and right sides are curved instead of straight. The curves are "parallel" to each other.

I don't know how else to describe it... It kind of looks like a very thick letter C, but with a flat top and bottom. Does this shape have a name?

Thanks very much!

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Arrow 22 replies Author Time Post
Reply Math, possibly geometry?, question. (Original post)
femmocrat Jan 2014 OP
NRaleighLiberal Jan 2014 #1
femmocrat Jan 2014 #6
rug Jan 2014 #2
femmocrat Jan 2014 #5
Captain Stern Jan 2014 #3
femmocrat Jan 2014 #4
jakeXT Jan 2014 #7
femmocrat Jan 2014 #8
jakeXT Jan 2014 #9
struggle4progress Jan 2014 #10
Raine1967 Jan 2014 #11
femmocrat Jan 2014 #14
jakeXT Feb 2014 #19
femmocrat Feb 2014 #20
pokerfan Jan 2014 #12
femmocrat Jan 2014 #15
pokerfan Feb 2014 #22
applegrove Jan 2014 #13
femmocrat Jan 2014 #16
Laura PourMeADrink Jan 2014 #17
mia Feb 2014 #18
femmocrat Feb 2014 #21

Response to femmocrat (Original post)

Fri Jan 31, 2014, 06:58 PM

1. not that I can tell...take one of those words one uses in scrabble that looks like it

should be a word, but isn't....and christen that shape with the name!

I did a geometric shape search on google....no luck! (only spent a few minutes looking, though!)

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Response to NRaleighLiberal (Reply #1)

Fri Jan 31, 2014, 07:06 PM

6. Thanks, I searched google images. No luck.

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Response to femmocrat (Original post)

Fri Jan 31, 2014, 07:00 PM

2. Chris Christie.

 

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Response to rug (Reply #2)

Fri Jan 31, 2014, 07:06 PM

5. Nah.... he is round on all sides.

NOT a "fat" joke, people. Don't yell at me!

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Response to femmocrat (Original post)

Fri Jan 31, 2014, 07:03 PM

3. Not one of the more common shapes, but like all symetrical shapes it does indeed have a name.

It's usually referred to as the Whatthefuckisthatazoid.

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Response to Captain Stern (Reply #3)

Fri Jan 31, 2014, 07:05 PM

4. LOL

I can't say that in school!

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Response to jakeXT (Reply #7)

Fri Jan 31, 2014, 07:21 PM

8. Thanks, but the curves are wrong.

They should curve the same way.... like parallel, if curves can be parallel. If you reverse one of the curves, that would be it. Like two parentheses: ( ( or

(__( << Like this, but with another line on top.

I never knew there was a shape called a "stadium"!!! I can use too!

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Response to femmocrat (Reply #8)

Fri Jan 31, 2014, 07:39 PM

9. Sounds like a lens, maybe this negative meniscus ?


http://en.wikipedia.org/wiki/Lens_%28optics%29
http://en.wikipedia.org/wiki/Meniscus
I first thought about convex concave

But that's all 3d in 2d projection

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Response to jakeXT (Reply #9)

Fri Jan 31, 2014, 08:05 PM

10. "lens-shaped" might be a good generic term that covers all of those

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Response to jakeXT (Reply #9)

Fri Jan 31, 2014, 09:17 PM

11. I was thinking of an image like that.

Negative Maniscus!

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Response to jakeXT (Reply #9)

Fri Jan 31, 2014, 10:50 PM

14. That's it!

Thank you so much. I was hoping for a nice simple term though. We are talking first graders. "Stadium" would have been cool.

Maybe I should just invent a term like NRaleghLib recommended! LOL I keep calling it "that shape we learned". It has a lot of applications in art class.

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Response to femmocrat (Reply #14)

Sat Feb 1, 2014, 09:08 AM

19. I believe back then I only had to color triangles, circles and rectangles

I wonder where the shape came from?

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Response to jakeXT (Reply #19)

Sat Feb 1, 2014, 10:40 AM

20. A lot has changed since either of us attended first grade!

LOL We are in the age of standardized testing of babies. Seriously though, it isn't a math shape. I am using it in art class and was hoping to connect it to math, which we have to do now.

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Response to femmocrat (Reply #8)

Fri Jan 31, 2014, 10:05 PM

12. Are the curves segments of concentric circles?

Which I guess is the only way they could be parallel. Don't know of a name for it but is it something like this:



http://chestofbooks.com/crafts/metal/Sheet-And-Plate-Metal-Work/Segment-Of-Circle-Method.html#.UuxWQPiBudk

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Response to pokerfan (Reply #12)

Fri Jan 31, 2014, 10:59 PM

15. That is almost it. Thank you very much.

Too bad it doesn't have a catchier name, though. We use that shape for so many things in art class. The one we are using has parallel straight ends though. I guess a circle could be sliced that way... and then turned sideways..... ?

Wow, your example is from a sheet metal book! I could tell them about that part to relate it to real life. There are a lot of mechanics and machinists around here.

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Response to femmocrat (Reply #15)

Sat Feb 1, 2014, 12:29 PM

22. Looks like it's called a "sector of an annulus"

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Response to femmocrat (Original post)

Fri Jan 31, 2014, 10:38 PM

13. I was great at working proofs in geometry back in grade 11. Don't remember much

about it these days. But we never had a name for that in either French or English.

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Response to applegrove (Reply #13)

Fri Jan 31, 2014, 11:00 PM

16. I was too. But I have forgotten just about all of it.

The fourth graders had to explain "rhomboid" to me. Remember that one!

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Response to femmocrat (Original post)

Fri Jan 31, 2014, 11:29 PM

17. no name

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Response to femmocrat (Original post)

Sat Feb 1, 2014, 12:30 AM

18. Is it a cylinder segment?

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Response to mia (Reply #18)

Sat Feb 1, 2014, 10:43 AM

21. I guess it could be.

The straight edges are parallel though, like a parallelogram. (I teach cylinders in third grade.)

Thank you!

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