Mathematical genius needed

[lankeela]

Need to buy plastic chain to enclose an area 45 square metres. How much chain would I need to buy? Must be a minimum width of 6.15 metres wide.
Obviously would need posts as well one for each corner and maybe one or two per side. I have a total mental block when it comes to working out anything like this, should have stayed for double maths instead of skiving.

[factor-fiction]

It depends on the shape- if it's square you'll need less than if it's a rectangle.

[factor-fiction]

Please can you tell me the shape and the lengths. Ta

[ChuckFickens]

Quite :)

Though if you went for the minimum width the other sides would have to be 7.32M so yoou'd need

2*7.32=14.64
plus
2*6.15=12.3

12.3+14.64=26.94m

[factor-fiction]

If you have worked out the area as 45 square metres does this mean you have already measured the sides of the square/rectangle - if so then just add all the side lengths together to give you the periemeter

[ChuckFickens]

I'm guessing this is a requirement of some type of dog training/display area that states the minimum area and width.

[factor-fiction]

You can get by with an even smaller length of chain if you make a circle!

[factor-fiction]

A circle of diameter of 7.57 metres ( radius of 3.78m) would give you an area of 45 square metres and would need only 23.8 metres of chain

[lankeela]

Chuck is right - dog show ring that has to be a minimum of 45 sq mt and with a minimum width of 6.15. Area would depend on the layout of the hall/venue but probably rectangular and this is a minimum. We could have shorter lengths and more posts, but just need to know we have enough for the minimum. So if I got about 30 metres that should cover it?

[ChuckFickens]

true, you'd need a cirlce with a radius of about 3.8m so you'd need 11.93M of chain for a circle :)

[ChuckFickens]

Yes, assuming a rectangle of the minimum width and area 30m should be plenty

[gingejbee]

If it has four sides then the actual dimensions don't make *that much* difference. 28 metres should cover (surround) all eventualities.

[factor-fiction]

Yes I agree that 30m is more than enough
I think you need to double your answer for the circle, chuck. Area = 2x Pi x radius (or pi x diameter as it is taught nowadays)

[ChuckFickens]

Yeah, I forget to double the radius in that one :)

I did consider removing my own post to save face but that may be an abuse of power :)

[anotheoldgit]

ChuckFickens

Excuse me for butting in but how does one remove one's own post?

[ChuckFickens]

You can't AOG. Mods can remove any post they see fit for removal though.

[factor-fiction]

You can email the Ed or report your own post and hope it gets removed, but the only way to do it yourself is if you are a moderator

[anotheoldgit]

Thanks for the reply, I didn't realise you were a Mod. chuck.

[ChuckFickens]

Shocking, isn't it :)

[wiltsman]

Will the chain be pulled taut, or will there be a slight sag between the posts, as is often the case with plastic chain. If there is to be a bit of a sag between the posts, it might be best to add a couple of extra metres to allow for this.

[lankeela]

Good point, its only for decoration so will probably need to be a bit saggy! Also will need enough if we change venues and have room for a bigger ring next time. Thanks for all your answers. I knew I didn't need to stay for double maths!