# "oblique line of symmetry"

Discussion in 'Primary' started by jog_on, Feb 24, 2008.

1. ### jog_onNew commenter

I don't really understand what it means. My maths knowledge is really letting me down.

Please could someone explain it in level 3 language??? I am not yet a level 4 (clearly!!!)

I need to plan it into my plenary for my APP HAP child in maths.

Thanks

2. ### jog_onNew commenter

I don't really understand what it means. My maths knowledge is really letting me down.

Please could someone explain it in level 3 language??? I am not yet a level 4 (clearly!!!)

I need to plan it into my plenary for my APP HAP child in maths.

Thanks

3. ### flookbird

Ha ha - I had to look this up last week as well - it's not horizontal or vertical, so basically, it's a diagonal mirror line!

4. ### trinity0097New commenter

I personally don't think you need to use it! Never come across it whilst teaching KS3/GCSE or A-Level, or whilst on my degree!

It's just a line of symmetry!

5. ### jog_onNew commenter

So would that depend on the orientation of the shape? For example, a square's oblique line of symmetry would be from corner to corner??? Or would it only be that when the square is in its usual position???

*confused*

6. ### trinity0097New commenter

Precisely why you don't need a silly word, it's just a line of symmetry!

7. ### jog_onNew commenter

If you look on the level 3/4 APP guidelines, it is on there in the understanding shape section, level 4. I need to show for my obs that I am taking this on board, so I want to direct my questioning appropriately. Might have to rethink this a little bit and think of a different obj.

Thanks

8. ### flookbird

Yes, taht is why I looked because it was on the assessment grids....I took it as meaning a mirror line for reflection though....oh well!

9. ### flookbird

Oh, what's APP HAP by the way?

10. ### jog_onNew commenter

APP = assessing pupils' progress

HAP = higher ability pupil

Thanks, I think

Still confuzzled!

11. ### trinity0097New commenter

I think you should interpret it as the pupils can recognise a mirror line when the mirror line isn't horizontal or vertical based on how you have the picture. Rather than the pupils being able to call it some new invented made up name!

(it amazes me how many terms have been 'invented' by the people who work for the primary strategy etc!)

12. ### jog_onNew commenter

Ok, thank you Trinity!!! Has helped a lot

13. ### Gertie Grumbles

i would say - can they turn the book/page around a little to put the mirror line vertical?
tehe!

Thank you

15. ### lambchop1966

hi
I alway tell my children to turn the page and look at problems with the mirror line vertically so i suppose that means they know how to deal with an 'oblique' or maybe this step on APP is trying to confirm whether or not they can do this without turning the page so really it is all about the ability to mentally rotate and mentally reflect in any plane - no-one really talks about this much. Should mental rotation be on the APP written down as the skill it is, instead of perhaps hiding behind some maths term to make it look more like progression, by the APP writers.