You can call it anything you like.
sphere
name a line that is not contained in plane N.
postulates
Yes, it is called the "Nezer Point".
Euclidean geometry, non euclidean geometry. Plane geometry. Three dimensional geometry to name but a few
You can call it anything you like.
Not sure about a name, but "an infinite surface with zero curvature" is an equivalent phrase.
jet plane
It usually names a line.
Istanbul the capital of Turkey name begins with the letter I.
The capital of Norway, which is Oslo.
supermarket does not have a capital letter unless it is the name of a supermarket like Asda or Tesco.
The first letter of a person's name is always a capital letter.
A capital letter is to start a sentence or when you use a name or place. Lowercase is the smaller of the two types.
No, a capital letter is not typically used after a slash in written language unless it is a proper noun or name.
Yes. It's the name of a holiday. You always write holidays with a capital letter.