The standard form of the equation of an ellipse With the center at the origin And the major axis horizontal X squared over A squared Plus Y squared over B squared Equals one and the vertices Plus or minus A, zero The standard form of the equation of an ellipse With the center at the origin And the major axis vertical X squared over B squared Plus Y squared over A squared Equals one and the vertices Zero, plus or minus A Co-vertices Co-vertices Co-vertices Co-vertices Co-vertices Co-vertices