Yes. For the same reason that every Wednesday is a day, every golf ball is a ball, and every woman is a human being.
a giftcard, the side of a box, a peice of paper, the screen of your computer, a post-it note, a window, a TV screen, a picture frame, as door , a square , a rectangle , a trapizoid , a white board , a black board , a parrallelgram ( a shape with 2 or more side that are parallel )
A square, all four sides are equal length. A rectangle has 4 sides, 2 parallel sides are a different length than the other two. A parallelogram is a rectangle where the two adjoining sides are not at a 90 degree angle to each other, but opposite sides are parallel to each other.