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).
Sample Question: Find the radius of a circle, given that the center is at (2, â3) and the point (â1, â2) lies on the circle. Work: Using the distance formula, plug in points (2, -3) and (-1, -2) into the distance formula. #sqrt((-2-(-3))^2+(-1-2)^2#. #=sqrt((1)^2+(-3)^2#. #=sqrt(1+9#.