Parabola Focus and Directrix 1

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 equation of a parabola.

Concepts

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parabolas, graphing quadratics

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Additional Tags

directrix, parabola, graphs of parabola, math

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Resource Details

Grade

10th - 12th

Subjects

Math

2 more...

Resource Type

Instructional Videos

Media Length

14:31

Audiences

For Teacher Use

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Instructional Strategy

Flipped Classroom

Accessibility

Closed Captions

Usage Permissions

Creative Commons

BY-NC-SA: 3.0