They are straight lines.
Infinity goes on forever and ever, and no matter how large a number you compare it to, your number will still be infinitely far away from infinity. To quote Caral Saga, "A googolplex [a huge number] is precisely as far from infinity as is the number one." However, there are, in fact, different levels of infinity. Conceptually, you can represent this by comparing a one-dimensional infinity on a number line with a two-dimensional infinity on a plane. A precise and complete answer to the cardinality of infinite sets can get pretty headdy. Check out http://en.wikipedia.org/wiki/Infinity#Set_theory for some interesting information.
One-dimensional example: A semi-infinite medium is a medium that extends to infinity in one direction but has an end in the other direction
similar
Bistable wave is a one-dimensional wave whose profile connects two stable equilibria asymptotically approaching one of them at minus infinity and the other one at infinity. In contrast, waves connecting one stable, one unstable equilibrium are called monostable.
Corresponding
You add the lengths of all the sides.
The sum of the lengths of all its sides. APEX
the sum of the lengths of all its sides
You can do this by simply adding all of the lengths of the sides.
They are said to be irregular shapes or polygons
The sum of the lengths of all its sides. APEX
It is a flat two dimensional surface which extends to infinity in all directions.