If someone asks you, what is the dimensions of the hair dryer, you could tell them the height and the width of the part you hold; you could then measure the height and width of the part in which the air comes out, then again, you could just tell them the volume in which the hair dryer occupies. No the handle is not, suppose 5.2" but the part in which the air is released, is 5.2".
You can not simply derive measurements such as height, width, and depth for a complicated shape such as a human body or car with more data. Even if you had this data, its extremely difficult to do. If your object was simple such as a cube, cylinder, or triangle and had more data,... we could calculate this a lot easier.
Not knowing any more than just the SA of say a box,... we can derive dimensions for say a box but there are infinitely many dimensions. This means the box can be of any shape or even size. If you give us the SA, L, and W, we can calculate the depth for example. If you only give the SA and L, that would mean the width and depth would be infinite.
I understand. A program I use only gave me those measurements from a irregular object, the program must be getting the information some how, some way, that is what I want to know ?
We both can agree that the program is not spitting out a random value for the surface area of the object !
Those would be tricky to work out. There's no easy formula as people and cars have many shapes.
You could estimate by making a square grid and holding it against the surface and counting up squares. Hard to be accurate though.
There are formulas for some solids: sphere, cone, pyramid etc.
What if you pretended as though the car, or person was contained, I believe as you are saying in a solid shape; as in a cube etc, that would work ?
I don't know what is so difficult to understand. Looking at the pipe image in post #34, you see it's a pipe that is bent. How can you measure it's length as if it was straight, not bent ? I've been told that I need to measure the bent angle of the pipe as well as the other straight areas, is there not a more intelligent way to do this, then having all these measurements at hand ?