Area of a circle?

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Area of a circle?
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vickersdc

Joined: 07 May 2006
Posts: 247
Location: Surrey / Hampshire Border.

Posted: Thu May 11, 06 11:23 am Post subject:

tahir wrote:

What's Pi? (Haven't had much cause to use it in the 25 years since I left school)

PI is a constant - it's the ratio between the circumference of a circle and it's diameter. That means the circumference is ALWAYS 3.14... times the diameter of any circle.

Cheers,
David.

dougal

Joined: 15 Jan 2005
Posts: 7184
Location: South Kent

Posted: Thu May 11, 06 11:31 am Post subject:

tahir wrote:

dougal wrote:

you could find 20 1tonne (1m cube) IBC's @ �40 each in quantity ...

But then you'd have to link em all up.

Not too hard, surely? And being modular, you could easily start with say 5, and add more as required.

[quoteJust had another thought. what if we break up the old slab and use that as a base for the new? It'd be more expensive but then it'd be a more "proper" job wouldn't it?[/quote]
It just be hardcore.
Now if you could find someone who would diamond drill a small hole through the existing slab, you could find out its true thickness. Or maybe a minimal size excavation at the edge?

Just a thought. Your existing slab isn't quite flat. This is likely for drainage, rather than being accidental or (heaven help you) a result of subsidence.
If you are putting a metal (steel?) tank on top of a new (rather bigger than the tank) slab - don't you want that slab to drain?

Jb

Joined: 08 Jun 2005
Posts: 7761
Location: 91� N

Posted: Thu May 11, 06 11:36 am Post subject:

vickersdc wrote:

tahir wrote:

What's Pi? (Haven't had much cause to use it in the 25 years since I left school)

PI is a constant - it's the ratio between the circumference of a circle and it's diameter. That means the circumference is ALWAYS 3.14... times the diameter of any circle.

Cheers,
David.

unless you do bizarre noneuclidean geometry ...
or try and work in more than 3 dimensions ...
or are just doing a quick reality check ...

... which is why for a some first order calculations I used to be able to get away with the assumption pi = 1!. Well it was often close enough to show something wouldn't work and made the maths a lot easier.

But assuming your in the same universe as most people and don't want it to break apart then 3.14 is probably a better estimate.

tahir

Joined: 28 Oct 2004
Posts: 45674
Location: Essex

Posted: Thu May 11, 06 11:38 am Post subject:

dougal wrote:

Or maybe a minimal size excavation at the edge?

Where'd you find a man with a diamond bit? there are two slabs next to each other so can't dig out a bit to check.

The slab is indeed used to angle the water into the drains but we'll be diverting most of the rainwater into the tank now, and will leave a channel for excess too.

Bernie66

Joined: 14 Jan 2005
Posts: 13967
Location: Eastoft

Posted: Thu May 11, 06 11:39 am Post subject:
Hire a diamond cutting kit and heavy duty drill for a day

tahir

Joined: 28 Oct 2004
Posts: 45674
Location: Essex

Posted: Thu May 11, 06 11:39 am Post subject:

JB wrote:

But assuming your in the same universe as most people and don't want it to break apart

That's a couple of huge assumptions you're making there....

dougal

Joined: 15 Jan 2005
Posts: 7184
Location: South Kent

Posted: Thu May 11, 06 11:41 am Post subject:

JB wrote:

... I used to be able to get away with the assumption pi = 1!. Well it was often close enough to show something wouldn't work and made the maths a lot easier.

Oh come on! Multiplying and dividing by 3 isn't that hard, really!

sean
Downsizer Moderator

Joined: 28 Oct 2004
Posts: 42219
Location: North Devon

Posted: Thu May 11, 06 11:41 am Post subject:
Didn't one of the states of the US decide that pi was 4 at one point because it made sums easier?

Northern_Lad

Joined: 13 Dec 2004
Posts: 14210
Location: Somewhere

Posted: Thu May 11, 06 11:44 am Post subject:

sean wrote:

Didn't one of the states of the US decide that pi was 4 at one point because it made sums easier?

I think they went with 3, because that's what it says in the Bible.

dougal

Joined: 15 Jan 2005
Posts: 7184
Location: South Kent

Posted: Thu May 11, 06 11:46 am Post subject:

Northern_Lad wrote:

sean wrote:

Didn't one of the states of the US decide that pi was 4 at one point because it made sums easier?

I think they went with 3, because that's what it says in the Bible.

... well, to the nearest Cubitt...

Jb

Joined: 08 Jun 2005
Posts: 7761
Location: 91� N

Posted: Thu May 11, 06 11:46 am Post subject:

dougal wrote:

JB wrote:

... I used to be able to get away with the assumption pi = 1!. Well it was often close enough to show something wouldn't work and made the maths a lot easier.

Oh come on! Multiplying and dividing by 3 isn't that hard, really!

... that's easy for you to say on thursday, try again on a friday afternoon

vickersdc

Joined: 07 May 2006
Posts: 247
Location: Surrey / Hampshire Border.

Posted: Thu May 11, 06 1:50 pm Post subject: Re: Area of a circle?

tahir wrote:

What's the area of a circle with a 3.66mtr diameter?

Thats nearly half a perch in old money isn't it?

Rob R

Joined: 28 Oct 2004
Posts: 31902
Location: York

Posted: Thu May 11, 06 1:59 pm Post subject:

tahir wrote:

dougal wrote:

you could find 20 1tonne (1m cube) IBC's @ �40 each in quantity ...

But then you'd have to link em all up.

Just had another thought. what if we break up the old slab and use that as a base for the new? It'd be more expensive but then it'd be a more "proper" job wouldn't it?

I'd go along with that idea.

And as for IBC's, I don't know where exacly this tank will be going, but a load of them could look quite unsightly, take more cleaning, filling & emptying & may be an issue for the planners (

)

tahir

Joined: 28 Oct 2004
Posts: 45674
Location: Essex

Posted: Thu May 11, 06 2:02 pm Post subject: Re: Area of a circle?

vickersdc wrote:

Thats nearly half a perch in old money isn't it?

Come again? I'm not thinking of fish farming but now you mention it...

tahir

Joined: 28 Oct 2004
Posts: 45674
Location: Essex

Posted: Thu May 11, 06 2:03 pm Post subject:

Rob R wrote:

tahir wrote:

Just had another thought. what if we break up the old slab and use that as a base for the new? It'd be more expensive but then it'd be a more "proper" job wouldn't it?

I'd go along with that idea.

Got someone coming to price it on Saturday

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