The directrix and focus of a parabola determine its shape, size, and direction. There is a formula for finding the directrix and focus. Examples are included.

Learn how to find the focus and directrix of a parabola and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn how to find the equation of a parabola with its focus and directrix in this bite-sized video lesson. Enhance your geometry skills by taking a quiz for practice.

Learn how to find the directrix from the general form of an equation, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn how to derive the equation of a parabola given its focus and directrix, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn how to find the focus and directrix of a parabola in vertex form, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

A parabola is the set of all points that have a greater y value than a single point, called the focus of the parabola, and a lesser x value than a single point, called the directrix of the parabola.

A parabola has a directrix of y = 8 and a focus of (0, 2). Show that the point (12, -7) must lie on this parabola.

The vertex is the midpoint of the segment whose endpoints are the focus and the intersection between the axis of symmetry and the directrix. How do you find the vertex and axis of symmetry?

A parabola is a curve in which each point on the curve is equidistant from another point called a focus and a straight line called a directrix. A parabola equation has the parent equation of y=x^2 ...