| A | B |
|---|
| Center of an Ellipse | the midpoint of the major axis of an ellipse. |
| Circle | the set of all points that are equidistant from a fixed point, called the center. |
| Conic Sections | a curve formed by the intersection of a plane and a double-napped cone. Examples include parabolas, circles, ellipses, and hyperbolas. |
| Discriminant of a 2nd degree | the expression B^2 - 4AC for the equation Ax^2 + Bxy + Cy^2 + Dx + Ey +F = 0. |
| Distance Formula | the distance between the points (x1, y1), (x2, y2) is sq rt of (x2 - x1)^2 + (y2 - y1)^2. |
| Ellipse | the set of all points P such that the sum of the distances between P and two foci is a constant. |
| General 2nd Degree Equation | the form Ax^2 + Bxy + Cy^2 + Dx + Ey +F = 0. |
| Hyperbola | the set of all points P such that the difference of the distance from P to two foci is a constant. |
| Midpoint Formula | the midpoint of the line segment joining A(x1, y1) and B(x2, y2) is M((x1 + y1)/2, (y1+y2)/2). |
| Parabola | the set of all points equidistance from a point called the focus and a line called the directrix. |
