Illustrative Mathematics
Illustrative Mathematics: G Gpe Defining Parabolas Geometrically
The purpose of this task is to show that the points on a parabola can be characterized by being equidistant from a point (the focus) and a line (the directrix). Aligns with HSG-GPE.A.2.
Purple Math
Purplemath: Conics: Parabolas: Introduction
This reference material introduces the terms and equations related to parabolas in the context of conics. Also, relates concepts to previously-learned material and shows how to 'read' from the 'conics' form of the parabola equation.
Khan Academy
Khan Academy: Equation of a Parabola From Focus and Directrix
Given the focus and the directrix of a parabola, find its equation. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
CK-12 Foundation
Ck 12: Analysis: General Forms of Conic Sections
[Free Registration/Login may be required to access all resource tools.] This lesson covers changing a general second-degree equation into the standard form of a parabola, ellipse, circle or hyperbola. Students examine guided notes,...
Khan Academy
Khan Academy: Equation of a Parabola From Focus & Directrix
Given the focus and the directrix of a parabola, find its equation.
Math Words
Math words.com: Parabola
The definition for what a parabola is and an explanation of the difference between a parabola and u-shaped curve is given. Also provides illustrations of what a vertical and horizontal parabola look like.
ClassFlow
Class Flow: Algebra, Geometry Conic Review
[Free Registration/Login Required] Flipchart helps student to interpret algebraic equations and inequalities, geometry (cones, spheres, parabolas, etc.) and describes geometric relationships algebraically.
Math Words
Mathwords: Directrix of a Parabola
A definition and example that shows what a directrix of a parabola is.
Windstream
Ojk's Precalculus Study Page: Parabolas
Good study tutorial about parabolas. There are examples of finding the equation of the parabola or the focal point and directrix that students can examine and attempt.
Science Struck
Science Struck: Real Life Examples of a Parabola
Explains what a parabola is and the vocabulary used to describe one and gives several examples of parabolas in real life.
Math Open Reference
Math Open Reference: Parabola
Learn about the three ways to define a parabola: Focus and Directrix, The Graph of a Function, and As a Conic Section. Examples are provided.
Math Words
Math words.com: Vertex, Parabola
The definition is given for what the vertex is. An example illustration is also given.
Math Words
Math words.com: Axis of Symmetry of a Parabola
A basic definition for what the axis of symmetry of a parabola is, along with an illustration.