If the 2 nonparallel sides are of equal length it is a regular trap. Otherwise it is not.
trapiziod
A trapizoid is particularly a shape in which, has precicely four sides to be exact.
Similar polygons have congruent angles and the same shape (but not necessarily the same size). Since the shape of a square and a rectangle is different from the shape of a trapezoid, they are not similar to it.
No.
no
Yes
It is the triangle which has only 3 sides whereas the rest have 4 sides.
4
regular
no it isn't a regular shape
yes
They are both 4 sided quadrilaterals but a trapezoid has different properties than an isosceles trapezoid which has 2 equal base angles.