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).
Circle, Its Perimeter and Area. Circle is the set of points on a fixed distance from a given point; the latter is called the center while that distance is the radius of the circle. The word radius has also another meaning: a line segment from the center to any point on the circle is also called radius. A line joining any two points on a circle is called chord; a chord that passes through the center is known as a diameter diameter is formed by two radii.