Hello!
In geometry there are three dimensions.
Something that is one dimensional is neither flat, wide, or tall. It is just a line.
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Something two dimensional is flat and wide but has no height. An example of this is a square.
Something three dimensional is wide and tall, and has flat faces. An example is a cube.
To answer your question something one dimensional is something that is not flat, wide, or tall, such as a line.
Hope this helped!
No it is not. If you had two fixed diagonals which are attached in the center, when they move it creates different parallelograms. The area would be close to zero if they were parallel.
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6. Linear
7. Not