Answer:
Technically, this figure is all of them, but more specifically, a square
Step-by-step explanation:
Definitions:
Rectangle: Quadrilateral that is equiangular
Rhombus: Quadrilateral that is equilateral
Square: An equiangular, equilateral quadrilateral
Counting the sides of all sides show us that <em>this quadrilateral is equilateral</em>, and knowing that all x = ₙ and y = ₙ are perpendicular shows us that<em> this quadrilateral is equiangular</em>.
So, this figure is all of those shapes, most specifically a square.