Quadrilateral.
square
They are both shapes. they are both a quadrilateral. 4 corners and 4 sides.
Parallelograms Examples: Squares and rectangles
It has 4 corners and 4 sides because it is a quadrilateral polygon
Square, Rectangle, Parallelogram, Rhombus, Trapezium, Diamond, Kite
Quadrilateral.
square
It is a square as square has 4 sides and all of them are equal. Also it has 4 corners.
Square, Rectangle, Rhombus & Parallelogram
They are both shapes. they are both a quadrilateral. 4 corners and 4 sides.
Parallelograms Examples: Squares and rectangles
It is very possible considering non-closed shapes. For example, picture the letter "M" but drawn into the third dimension, sort of like a open roof gutter (which has 2 corners and 3 sides). It will have 3 corners and 4 sides (an "L" would have 1 corner and 2 sides).
A trapezoid I think... It's kinda like (youre gonna have to use youre imahination a little here) /=\
4 sides and 4 corners because it is a quadrilateral polygon
2 sides, 2 corners. (:
A trapezoid has 4 corners and 4 sides