Parabolas from focus and directrix

Understand parabolas from their geometric definition: equal distance from a focus and a directrix. This precalculus practice connects vertical and horizontal standard forms with vertices, axes, opening direction and focal width. Single-select and multiselect questions progress from interpreting equations to reconstructing a parabola from a coordinate diagram and checking the distance definition directly. Detailed explanations distinguish the signed focal parameter from nonnegative distances and widths. The set prepares you for parabola reconstruction and reflector modeling without using calculus.