Escitalopram is an oral drug that is used for treating depression and generalized anxiety disorder. Chemically, escitalopram is similar to citalopram . Both are in a class of drugs called selective serotonin reuptake inhibitors (SSRIs), a class that also includes fluoxetine , paroxetine and sertraline .
1 A circle is all of the points that are a fixed distance, known as the radius, from a given point, known as the center of the circle. 2  Explore the standard equation of a circle using the applet below (Go here for a larger version).
Cartesian coordinate system with a circle of radius 2 centered at the origin marked in red. The equation of a circle is (x â a)2 + (y â b)2 = r2 where a and b are the coordinates of the center (a, b) and r is the radius.