Math, possibly geometry?, question.

[femmocrat]

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!

[NRaleighLiberal]

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!)

[femmocrat]

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

[rug]

2. Chris Christie.

[femmocrat]

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

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

[Captain Stern]

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.

[femmocrat]

4. LOL

I can't say that in school!

[jakeXT]

7. Stadium ?

http://en.wikipedia.org/wiki/Stadium_%28geometry%29

[femmocrat]

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!

[jakeXT]

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

[struggle4progress]

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

[Raine1967]

11. I was thinking of an image like that.

Negative Maniscus!

[femmocrat]

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.

[jakeXT]

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

I wonder where the shape came from?

[femmocrat]

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.

[pokerfan]

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

[femmocrat]

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.

[pokerfan]

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

http://mathcentral.uregina.ca/QQ/database/QQ.09.08/h/ed4.html

[applegrove]

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.

[femmocrat]

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!

[Laura PourMeADrink]

17. no name

[mia]

18. Is it a cylinder segment?

[femmocrat]

21. I guess it could be.

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

Thank you!