No, it is not because a quadrilateral is generally not a regular polygon.
Only if the quadrilateral is a square.
A regular tessellation is when polygons are joined together leaving no gaps or overlaps
Assuming that the question refers to a regular octagon (not a regualr otagon), the answer is no.
Yes, any quadrilateral can be used.
a square
true
Tessellation is defined as the tiling of a plane using one or more geometric shapes, called tiles, with no overlaps and no gaps. In mathematics, tessellations can be generalized to higher dimensions. A periodic tiling has a repeat pattern. A regular quadrilateral can be used by itself to make a tessellation.
Yes, any quadrilateral will tessellate.
The sum of all the angles of a quadrialateral, whether its regualr or irregular is 360 degrees.
A regular triangle, quadrilateral (i.e., square) and hexagon may be used.
Yes it is a tessellation.
Non-visible tessellation or non-existent tessellation, perhaps.