Maths Wizardy help needed.

[Chris_w666]

Can someone who is clever with maths, or google I am not fussy, help me to work out the surface area of a piece of land that is a rather odd shape. I know the distance around the perimeter is 3.23km but can't remember if a formula exists to work out area from just this figure.

[Tom_C76]

Not possible to work out area from perimeter, as vastly different shapes can have the same perimeter.

[Chris_w666]

Bugger, looks like I shall have to resort to map and ruler then

[cv01jw]

If you have a scan I could import into CAD and get an area really quickly.

[MX7]

Google Earth Pro does area I think, and you can try it for 7 days free.

Edited by MX7 on Wednesday 11th November 09:46

[Chris_w666]

cv01jw said:

If you have a scan I could import into CAD and get an area really quickly.

I have the plan as a gif image but am not 100% sure of the scale, as it seems to have been cut off when it was scanned.

[cv01jw]

Chris_w666 said:

cv01jw said:

If you have a scan I could import into CAD and get an area really quickly.

I have the plan as a gif image but am not 100% sure of the scale, as it seems to have been cut off when it was scanned.

I can give it a go. Without a scale there will be an element of guessing though

[Chris_w666]

cv01jw said:

Chris_w666 said:

cv01jw said:

If you have a scan I could import into CAD and get an area really quickly.

I have the plan as a gif image but am not 100% sure of the scale, as it seems to have been cut off when it was scanned.

I can give it a go. Without a scale there will be an element of guessing though

Cheers have sent a PM I think it is 1:100

[fido]

Reminds me of counting the squares at junior school .. a rather Monte-Carlo approach to guestimating the area .. though i'd imagine it's now part of GCSE Maths as part of the continuing dumbing-brown of education.

[37Flipper]

fido said:

Reminds me of counting the squares at junior school .. a rather Monte-Carlo approach to guestimating the area .. though i'd imagine it's now part of GCSE Maths as part of the continuing dumbing-brown of education.

It probably is, I was very surprised to learn that pi=3 nowadays at school!!!!!

[cv01jw]

37Flipper said:

fido said:

Reminds me of counting the squares at junior school .. a rather Monte-Carlo approach to guestimating the area .. though i'd imagine it's now part of GCSE Maths as part of the continuing dumbing-brown of education.

It probably is, I was very surprised to learn that pi=3 nowadays at school!!!!!

You sure it isn't now pi=chicken&mushroom?

[anonymous-user]

37Flipper said:

fido said:

Reminds me of counting the squares at junior school .. a rather Monte-Carlo approach to guestimating the area .. though i'd imagine it's now part of GCSE Maths as part of the continuing dumbing-brown of education.

It probably is, I was very surprised to learn that pi=3 nowadays at school!!!!!

Thats a wind up right? Please tell me its a wind up!

[Don]

anonymous said:

[redacted]

Absolutely. One of the fundamental constants. 3.1415927, to only 7dp I admit, just isn't 3. Even a little.

[Daniel1]

google earth can do it? you just map it?

[Murray993]

Don said:

Absolutely. One of the fundamental constants. 3.1415927, to only 7dp I admit, just isn't 3. Even a little.

Just 3 and a little.

[plover]

Found this when I wanted to do something similiar Google Map Area Calc

Obviously only works if you can see it on Google Maps, but I found it very usefull.

[Klankie]

I may be over simplyfing things here but, would you not just divide the perimeter by 4 and then multiply the answer by itself to get the area.

3.23km divided by 4= 0.8075 times 2= 1.615km squared

[Trevelyan]

Klankie said:

I may be over simplyfing things here but, would you not just divide the perimeter by 4 and then multiply the answer by itself to get the area.

3.23km divided by 4= 0.8075 times 2= 1.615km squared

Only if it's a perfect square. For all we know the plot is circular, or L shaped, etc. etc.

[Stevenj214]

Klankie said:

I may be over simplyfing things here but, would you not just divide the perimeter by 4 and then multiply the answer by itself to get the area.

3.23km divided by 4= 0.8075 times 2= 1.615km squared

Doesn't work. A 2x2 square would have a perimeter of 8 and an area of 4, a 4x1 rectangle would have a perimeter of 10 but still an area of 4.

[youngsyr]

Well, is it not possible to work out maximum and minimums for any shape with that perimeter?

Presumably the maximum would be a circle, what would be the minimum shape - I'm guessing it doesn't have a name, but is essentially a squiggly line that doubles back on itself a lot?