It's more of a stretched out circle.
Concentric Circles?
We call it a circle.
A circle with three dimensions is sphere.
Inscribed
ellipse
It's more of a stretched out circle.
An ovel is discribed a flat and stretched circle
Nothing, since there is no such word. However, an ellipse is a stretched out circle.
We call it a "semi-circle"
No. It is a 2-dimensional object; basically a stretched circle or oval.
A semi-circle
Concentric Circles?
We call it a circle.
The extent to which Mars' orbit differs from a perfect circle is called eccentricity. It measures how elongated or stretched out the orbit is compared to a perfect circle.
A circle with three dimensions is sphere.
The perimeter of a circle is called the circumference