a conic section
The white line painted around the oval to determine the field of play is called the boundary line.
The distance around a circle is called circumference. Around any other shape, it is called perimeter.
Out of Bounds. Boundary Lines, Borders.
A rectangular prism?
In geometry, a rectangular solid is called a rectangular solid. A cube is a rectangular solid that happens to have all surfaces equal.
A convergent boundary
the boundary is called a convergent boundary
It is called a cuboid.
It's called a rectangular prism