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 49 is a perfect square as 49 = 72. 2  The following are few more examples of perfect squares. .  Perfect Square trinomial: Trinomials of the form a2 Â± 2ab + b2, which can be expressed as squares of binomials are called perfect square trinomials.