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).
The distance between any point on the circle and its center is constant, which is known as the radius. A circle is formed when a plane intersect a cone, perpendicular to its axis. The circle is a special case of the ellipse where a=b=r, in the equation of the ellipse. ârâ is the radius of the circle.