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#1
06-21-2009, 03:07 PM
 Unregistered Guest Posts: n/a
perimeter to area

i need to convert a premeter of a 5 sided shape into an area m^2 the perimeter is 113.3m and i dont get any angles. please help
#2
06-21-2009, 03:28 PM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,231 Rep Power: 18
Re: perimeter to area

Quote:
 Originally Posted by Unregistered i need to convert a premeter of a 5 sided shape into an area m^2 the perimeter is 113.3m and i dont get any angles. please help
Just the perimeter isn't very helpful at all. It could be many different shaped figures with different areas.

If it were a regular pentagon, the area would be 1.72048*s², where s is the length of a side (p/5)

so, A = 1.72048*(p/5)² = 883.42 m². But, you don't know it is a regular pentagon, which would be the maximum area for a given perimeter, so all we know (without side lengths and angles os
0 < area < 883.42 m²

Very frankly, this upper bound is only useful in a theoretical sense, as it could be anywhere between that and zero.

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