Ellipses are not circles.
Because all circles are similar.
Small circles
No. There are big ones, medium ones, and little bitty ones.But all circles are similar.
small circles
Zero, or all if the circles coincide.
Yes
yes
All circles are plane curves drawn by a point that rotates 360 degrees at a constant distance from a fixed point.
a circle has 4 sides
Not all do. In fact, most do not.
Yes