Yes, it is indeed.
A circle....
A circle is a round geometrical shape
No one really because a circle is a natural geometrical shape seen throughout nature.
A cardioid is a type of geometrical shape that is a type of limacon. A cardioid is formed when a circle is rolled around another circle creating a curved shape.
spiders do not build geometrical shape webs
It is the circle's diameter
Geometrical symmetry is a mathematical term for a shape that, if torn in half, can be mirrored and restored to the shape again.
Yes. But any object is a geometrical shape of some sort. Even a blob is an irregular geometric shape!
We cannot assess the efficiency of a geometrical shape unless we have a particular purpose in mind. You will have to state what you wish to efficiently do, by means of a geometrical figure.
If you mean a round can, the shape is cylindrical.
Radii
because if it had 4 straight lines instead, we would call it a rectangle.