A circle is a round geometrical shape
a part of circle
Elliptical is used to describe an orbit or round shape that isn't perfectly circular - it's an ellipse, or oval.
It ultimately depends on the areas of the two shapes: Acircle = pi*r2 Asquare = l2 Fraction shaded = Acircle / Asquare = pi*r2/ l2 If the circle fills the square (e.g. l=2r) then the formula simplifies considerably: pi*r2/4r2 = pi/4
Geometric
There aren't any. Geometric is an adjective and you need a noun to go with it before it is possible to consider answering the question. There are geometric sequences, geometric means, geometric theories, geometric shapes. I cannot guess what your question is about.
If, by geometric number (?) you mean geometric mean, then the answer is 40.
A geometric painting
Algebraic is non-geometric.
Geometric echo is a repeating shape in a pattern. The stars on the US flag is a geometric echo.
Rhombus is the geometric name.
geometric solid
No.