Showing posts with label derivation of equation. Show all posts
Showing posts with label derivation of equation. Show all posts

Wednesday, January 25, 2012

Deriving the Equation of the Parabola

Instructions: Move point A to adjust the position of the vertical line and move F along the x-axis as desired. Move C along the line and observe what happens.
This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com

Questions
1. What can you say about line a in relation to C and F?
2. Make a conjecture about segments PC and PF.
3.) Suppose P has coordinates (x,y), F has coordinates (2,0), and line d has equation x = 2, write the equation that would describe your conjecture in 2.
4.) Generalize the equation in 3 by changing the coordinates of F to (a,0) and line d has equation x = -d. Find the value of y.

Download GGB file