Noun:
No.
No, a square is not a trapezoid.
No, a rhombus is not a trapezoid.
A Trapazoid
No, it does not.
there are 0 right angles in a trapazoid
No.
No.
no it is not
No, it is not.
a shape
Diagonals.
Not normally
Yes.
No.
No.
make a preliminary introduction, usually to a formal document