Anxiety Disorder Statistics. Anxiety Disorders affect 18.1 percent of adults in the United States (approximately 40 million adults between the ages of 18 to 54).
Perfect square. Perfect square is an element of algebraic structure which is equal to the square of another element. Square number, a perfect square integer.
1. Square: Square is a regular polygon and the best known quadrilateral. It consists equal sides and interior angles are all right angles. The distance around the area is called as perimeter. Since all the four sides of a square is of same length, the perimeter of a square is given as, '4 side'.