|WikiProject Mathematics||(Rated C-class, High-importance)|
Is it really correct that two dimensional structures such as triangles have "surface area" ? I do not think so, "surface area" is a three dimensional concept. Ar
- I've moved the table of areas of plane figures to the talk page of "Area". Arcfrk (talk) 08:48, 11 March 2008 (UTC)
Surface Area To Volume Ratios
There is a problem with the last section. It states that if you increase the radius the ratio decreases. However, if you change the units of measure, the ratio can increase with a larger radius. A radius of 100 meters has a SA:V ratio of .03, but a radius of 1 kilometer has a ratio of 3. Also, it should be clear that this is assuming cells have a spherical shape. —Preceding unsigned comment added by 188.8.131.52 (talk) 04:05, 30 March 2008 (UTC)
- SA:V is measured in inverse distance units. It is not dimensionless. A sphere with a radius of 100 meters has a ratio of 0.03/meter while the sphere with a radius of 1 kilometer has a ratio of 3/kilometer = 3/(1000 meters) = 0.003/meter. Measuring in the same units, the sphere ten times larger has a ten times smaller ratio, as it should. This similarity law holds for any shape, not just spheres. In the case of cells the only assumption is that a big cell is the same shape as a little one. This is more or less true of cells. It is definitely not true of multicellular structures, which is why one can easily distinguish a mouse bone from an elephant bone even when the mouse bone is magnified to elephantine size. -Dmh (talk) 05:32, 23
What. The. Hell.
I came here to verify a formula, but I ended up stumbling upon a page a 4th grader could have written. What in the world happened to this article?
- I came here to verify a formula, but I ended up stumbling upon a page a professor could have written. What in the world happened to this article? i can not understand any of this, perhaps someone could submit something eaiser to understand Summer911 (talk) 05:32, 10 March 2010 (UTC)
Moved from the article
|Shape||Area formula derivation|
|Sphere||The surface area of a sphere is the integral of infinitesimal circular rings of width
References recovered partially
http://web.archive.org/web/20120427201949/http://www.math.usma.edu/people/rickey/hm/CalcNotes/schwarz-paradox.pdf — Preceding unsigned comment added by 184.108.40.206 (talk) 22:10, 9 October 2013 (UTC)