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.
Square (Geometry) (Jump to Area of a Square or Perimeter of a Square) A Square is a flat shape with 4 equal sides and every angle is a right angle (90Â°)