No shape can have two corners
four sides and four corners
There is no such shape. If it has two sides meeting, it also has to have a corner. A triangle has three sides and three corners, and a square has four sides and four corners. There is nothing in between.
corners
It is a square as square has 4 sides and all of them are equal. Also it has 4 corners.
A square box
A quadrilateral.
A QUADRILATERAL has four corners and four sides, along with four angles. These do not need to be congruent (equal) but they can be.
Four corners and sides
A crescent has two [curved] sides and two corners.
A Square
Four each.