Fri Jan 31, 2014, 06:49 PM
femmocrat (28,199 posts)
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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22 replies, 2387 views
 22 replies |
Author | Time | Post |
 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
NRaleighLiberal (54,391 posts)
1. not that I can tell...take one of those words one uses in scrabble that looks like it
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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!) |
Response to NRaleighLiberal (Reply #1)
Fri Jan 31, 2014, 07:06 PM
femmocrat (28,199 posts)
6. Thanks, I searched google images. No luck.
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Response to rug (Reply #2)
Fri Jan 31, 2014, 07:06 PM
femmocrat (28,199 posts)
5. Nah.... he is round on all sides.
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.
Response to Captain Stern (Reply #3)
Fri Jan 31, 2014, 07:05 PM
femmocrat (28,199 posts)
4. LOL
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I can't say that in school!
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Response to jakeXT (Reply #7)
Fri Jan 31, 2014, 07:21 PM
femmocrat (28,199 posts)
8. Thanks, but the curves are wrong.
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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!  |
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 |
Response to jakeXT (Reply #9)
Fri Jan 31, 2014, 08:05 PM
struggle4progress (111,853 posts)
10. "lens-shaped" might be a good generic term that covers all of those
Response to jakeXT (Reply #9)
Fri Jan 31, 2014, 09:17 PM
Raine1967 (11,450 posts)
11. I was thinking of an image like that.
Response to jakeXT (Reply #9)
Fri Jan 31, 2014, 10:50 PM
femmocrat (28,199 posts)
14. That's it!
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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. |
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
Response to jakeXT (Reply #19)
Sat Feb 1, 2014, 10:40 AM
femmocrat (28,199 posts)
20. A lot has changed since either of us attended first grade!
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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?
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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 |
Response to pokerfan (Reply #12)
Fri Jan 31, 2014, 10:59 PM
femmocrat (28,199 posts)
15. That is almost it. Thank you very much.
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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.  |
Response to femmocrat (Reply #15)
Sat Feb 1, 2014, 12:29 PM
22. Looks like it's called a "sector of an annulus"
Response to femmocrat (Original post)
Fri Jan 31, 2014, 10:38 PM
applegrove (99,683 posts)
13. I was great at working proofs in geometry back in grade 11. Don't remember much
Response to applegrove (Reply #13)
Fri Jan 31, 2014, 11:00 PM
femmocrat (28,199 posts)
16. I was too. But I have forgotten just about all of it.
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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
Laura PourMeADrink (35,286 posts)
17. no name
Response to femmocrat (Original post)
Sat Feb 1, 2014, 12:30 AM
mia (7,560 posts)
18. Is it a cylinder segment?
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Response to mia (Reply #18)
Sat Feb 1, 2014, 10:43 AM
femmocrat (28,199 posts)
21. I guess it could be.
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The straight edges are parallel though, like a parallelogram. (I teach cylinders in third grade.)
Thank you! |
