### We found62 reviewed resources for directrix

18:28
Lesson Planet

#### Focus and Directrix of a Parabola 2

For Students 10th - 12th
Continuing from a previous video, Sal takes the discussion of the focus and directrix of parabola further. Given the parabola, y=x2, he derives the focus and directrix by matching parts of the equation he found earlier. He then, comes up...
14:31
Lesson Planet

#### Parabola Focus and Directrix 1

For Students 10th - 12th
Starting with a point (focus) and a line below the point (directrix), in this video, Sal tries to find the set of all points (locus) equidistant to the point and the line. He shows, using the distance formula, that indeed, we have an...
18:28
Lesson Planet

#### Focus and Directrix of a Parabola 2

For Students 10th - 12th
Continuing from a previous video, Sal takes the discussion of the focus and directrix of parabola further. Given the parabola, y=x2, he derives the focus and directrix by matching parts of the equation he found earlier. He then, comes up...
1 In 1 Collection 14:31
Lesson Planet

#### Parabola Focus and Directrix 1

For Students 10th - 12th
Starting with a point (focus) and a line below the point (directrix), in this video, Sal tries to find the set of all points (locus) equidistant to the point and the line. He shows, using the distance formula, that indeed, we have an...
Lesson Planet

#### Parabola With Horizontal Directrix

For Teachers 8th - 9th
Students find the vertex, directrix, and focus of a parabola and graph parabolic functions. They solve problems involving parabolas after a demonstration lesson plan by the teacher.
Lesson Planet

#### Properties of Parabolas

For Teachers 9th - 12th Standards
Explore the properties of parabolas in this lesson. Construct a parabola given a focus and a directrix on the Ti-Nspire. Write equations of parabolas in vertex form and determine the a value of a parabola given a focus and directrix.
Lesson Planet

#### Parabolas

For Teachers 11th - 12th
Learners define a parabola through hands on creation. For this algebra lesson, students analyze the directrix and focus of a parabola. They create a paper parabola and identify the vertex with points equal distance apart from the vertex.
Lesson Planet

#### Constructing a Parabola

For Teachers 9th - 12th
Students construct parabolas using Islamic Mathematics.  In this constructing parabolas using Islamic Mathematics lesson plan, students discuss parts of the parabola including vertex, focus, and directrix.  Students construct a parabola...
Lesson Planet

#### Anatomy of a Parabola

For Teachers 9th - 12th Standards
Look at parabolas from a different perspective. The lesson plan introduces the idea of the analytic interpretation of parabolas. Pupils learn the vocabulary associated with parabolas including the focus and directrix. They develop the...
Lesson Planet

#### Discovering Properties of Parabolas by Comparing and Contrasting Parabolic Equations

For Teachers 9th - 12th Standards
Here's a lesson with a laser focus on parabolas. Pupils learn how to derive the equation of a parabola given the equation of the directrix and the coordinates of the focus. Using a reference sheet, learners work in groups to derive the...
EngageNY

#### Are All Parabolas Congruent?

For Students 10th - 12th Standards
Augment a unit on parabolas with an instructive math activity. Pupils graph parabolas by examining the relationship between the focus and directrix.
Lesson Planet

#### 8.2 Skills Practice: Parabolas

For Students 10th - 12th
In this parabolas worksheet, students write equations in standard form. They identify the coordinates of the vertex and focus, the equations of the axis of symmetry and directrix. Students write an equation for a described parabola. This...
Lesson Planet

#### Properties of Parabolas

For Teachers 9th - 12th Standards
Have your learners investigate parabolas. In this Algebra II lesson plan, students explore the basic definition of a parabola by using Cabri Jr. to create a parabola given the focus and directrix.  Students interpret the equation for a...
Lesson Planet

#### Acting out a Parabola: the Importance of a Vertex and Directrix

For Teachers 9th - 12th Standards
Walk the ... parabola. Classmates use yarn to form a human parabola. They then apply what they learn to connect key features of a parabola to its equation.
Lesson Planet

#### Parabola with Horizontal Directrix

For Teachers 9th - 11th
Pupils find the vertex, directrix, and focus of a parabola. They graph parabolic functions and solve application problems involving parabalas.
Lesson Planet

#### Chapter 10 Review: Parabolas

For Students 10th - 12th
In this parabola activity, students find the vertex, focus, and directrix of a given parabola and graph the equation. They write equations for a graphed parabolas. Students write an equation of a graphed ellipse. This four page activity...
Lesson Planet

#### Parabola

For Students 10th - 12th
In this parabola learning exercise, students write the equation for a parabola using a specified focus, directrix or vertex. This one-page learning exercise contains ten problems.
Lesson Planet

#### Parabolas 7-2

For Students 8th - 10th
In this parabola worksheet, students define a parabola and all of its parts. They then solve 4 problems in which they change an equation into vertex form, identify the significant features, and graph it. Finally, students solve 3...
Lesson Planet

#### Parabolas

For Students 10th
In this parabolas worksheet, 10th graders solve and draw 10 different problems with figures related to various parabolas. First, they determine the vertex, focus, and the directrix in each equation. Then, students draw the parabola on a...
Lesson Planet

#### Parabolas

For Students 11th
In this parabolas activity, 11th graders solve and complete 7 different problems. First, they write each equation in the given form. Then, students name the coordinates of the vertex and focus. They also name the equation of the axis of...
Lesson Planet

#### Extra Practice 11.1: Parabolas

For Students 9th - 12th
In this parabolas worksheet, students solve 28 short answer problems. Students find the focus, directrix, axis, and equations of parabolas.  Students match the equation of a parabola with it's correct graph.
Lesson Planet

#### Explore the Properties of a Parabola and Practice Writing Its Equation

For Teachers 8th - 12th Standards
See how writing equations for parabolas is all about distances. Young mathematicians measure distances of line segments drawn on the graph of a parabola. Using the relationships they find in the segments, they write equations for...
Lesson Planet

#### A Point and a Line to a Parabola!

For Teachers 9th - 12th Standards
All it takes is one point and one line to find a parabola. Young mathematicians investigate how to find the equation of a parabola given the focus and directrix. Plotting points on a grid with both rectangular and circular overlays helps...
Lesson Planet

#### Definition of a Parabola

For Teachers 9th - 12th Standards
What information defines a parabola? Individuals learn to write the equation of a parabola given the focus and directrix. They attempt several problems of this type to help cement the concept.