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).
And that is the Standard Form for the equation of a circle! It shows all the important information at a glance: the center (a,b) and the radius r. Example: A circle with center at (3,4) and a radius of 6: Start with: (xâa) 2 + (yâb) 2 = r 2. Put in (a,b) and r: (xâ3) 2 + (yâ4) 2 = 6 2. We can then use our algebra skills to simplify and rearrange that equation, depending on what we need it for.