Equation of Circles https://www.youtube.com/watch?v=FjYaBqbCjbQLet's review what we already know about circles. Definition: A circle is a locus (set) of points in a plane equidistant from a fixed point.Now, if we "multiply out" the above example (x-2)2 + (y+5)2 = 9 we will get:(x-2)2 + (y+5)2 = 9 (x2-4x+4) +( y2+10y+25) = 9 x2-4x+4+ y2+10y+25 = 9 x2+ … [Read more...] about Equation of Circles