If it's a circle, then it's pi*diameter or 2*pi*radius.
If it is an ellipse, the circumference (perimeter) is an infinite series with an approximation based on its eccentricity (which for a circle is zero).
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The formula for finding probability depends on the distribution function.
No because the formula for finding the area of an oval, which is an ellipse, is quite different
There is no formula for this. You have to measure the volume.
The formula for finding area or mass of a cylinder is pi x radius^2density=massxvolume
The answers depend on what you want to "do" and what information you have.