Yes.
No, a square is an equilateral quadrilateral. http://en.wikipedia.org/wiki/Quadrilateral
A square.
A square
A square has four sides so it is a quadrilateral. All sides of a square are of equal length so it is equilateral. All angles of a square are of equal measure so it is equiangular. A quadrilateral that is equilateral and equiangular is a regular quadrilateral.
square
A square or a rhombus perhaps?
A rhombus and its variant (a square).
A square is a rectangle, a rhombus, an equilateral parallelogram, and a regular quadrilateral.
A square is an equilateral rectangle or an equiangular rhombus or a regular quadrilateral.
Yes. It's a right equilateral quadrilateral.
A rhombus, or its special case, the square.
Square.