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Andras
Group Title
Can someone give a proof for this theorem?
The circle has the largest area of all shapes, given a fixed perimeter.
 2 years ago
 2 years ago
Andras Group Title
Can someone give a proof for this theorem? The circle has the largest area of all shapes, given a fixed perimeter.
 2 years ago
 2 years ago

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henpen Group TitleBest ResponseYou've already chosen the best response.0
Not a formal proof, but here's the intuition. Imagine a cube, with a centre point. From this point radiate lines that touch the vertices of the cube. Sections such as thesedw:1350744197439:dw are formed. The area of any pyramid is 1/3 * base area * height. As you add sides to the polyhedron, the height increases, so the volume increases.
 2 years ago

henpen Group TitleBest ResponseYou've already chosen the best response.0
dw:1350744302510:dw
 2 years ago

henpen Group TitleBest ResponseYou've already chosen the best response.0
The total base area for the whole shape is held constant by the requirements of your question,
 2 years ago

henpen Group TitleBest ResponseYou've already chosen the best response.0
This proof is in 3D, 2D is much easier, but uses the same logic.
 2 years ago

Andras Group TitleBest ResponseYou've already chosen the best response.0
Sorry but this didnt help much. How is this cube related to a circle or a sphere?
 2 years ago

Andras Group TitleBest ResponseYou've already chosen the best response.0
I guess the proof for 3D + sphere is similar to the 2D and circle. But how does this cube section help?
 2 years ago

henpen Group TitleBest ResponseYou've already chosen the best response.0
It is the starting point: as you increace the number of faces, the volume goes up
 2 years ago

estudier Group TitleBest ResponseYou've already chosen the best response.1
http://www.math.utah.edu/~treiberg/isoperim/isop.pdf
 2 years ago
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