A line.
it only has one face and has no edges or vertexes and also is circular
Plane.
If you are a cube, one of the sides is called a face. Same with a cone, the flat part is a face.
-1
It would not fit unless you sliced off 2 of its dimensions.
A figure of speech
They are flat surface figures like squares and circles. 3D figures have length, width, and height like cubes and spheres.
It is a 7 sided heptagon whose 7 interior angles add up to 900 degrees
A pyramid is a solid figure with one vertix.
Rounded to one significant figure it becomes 20
1000 is written with one significant figure, with only the 1 being a significant figure.
Only one point. A dimensionless figure.