Children with expressive language disorder have difficulty conveying or expressing information in speech, writing, sign language or gesture. (For preschool children, the difficulty expressing themselves in writing is not evident, as they have not started formal education.)
A rectangle is defined as a parallelogram (a quadrilateral with two sets of parallel sides) with the non-parallel sides joining perpendicularly (at 90Â°). A square is a rectangle with the additional constraint the all four sides be of equal length.
show equal sides. A square has equal sides and every angle is a right angle (90Â°). Also opposite sides are parallel. A square also fits the definition of a rectangle (all angles are 90Â°), and a rhombus (all sides are equal length).