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# How do you calculate the perimeter of a shape from its area? Watch

1. If a farmer has an irregular shaped field of 5000 square metres how would he calculate its perimeter?

I've tried several formula but can't get it right.

Thanks
2. by using a ruler of course.
3. (Original post by KnowledgeIsBest)
by using a ruler of course.
Calculate not measure.
4. (Original post by Ambitious1999)
Calculate not measure.
the farmer can "measure" the perimeter of the field using a ruler.
5. You read the question wrong mate, try to calculate how much it will cost for you to buy new glasses...
Unless you are cheap enough to get free glasses from Specsavers...
Spoiler:
Show
Jking, I love you
6. you can find the minimum possible perimeter... that would involve the field being a specific shape ?
7. (Original post by Ambitious1999)
If a farmer has an irregular shaped field of 5000 square metres how would he calculate its perimeter?

I've tried several formula but can't get it right.

Thanks
If you don't know the shape, you can't calculate the perimeter. You can calculate a lower bound for the perimeter (the upper bound is infinity, in theory) but without a definite shape or something you can measure, there's no way of knowing what the perimeter is.
8. See the attached images for an example on how the perimeter can vary infinitely while the area remains the same.
Attached Images

9. (Original post by Plagioclase)
If you don't know the shape, you can't calculate the perimeter. You can calculate a lower bound for the perimeter (the upper bound is infinity, in theory) but without a definite shape or something you can measure, there's no way of knowing what the perimeter is.
Thanks that makes sense. Must have been a trick question
10. (Original post by Ambitious1999)
If a farmer has an irregular shaped field of 5000 square metres how would he calculate its perimeter?

I've tried several formula but can't get it right.

Thanks
What was the original question/problem?

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Updated: October 12, 2016
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