Copy of Lever

Lever
اهرم نوع اول

Ordering Rational and Irrational Numbers

An extension of Illustrative Mathematics applet for Lesson 6.7.3.3. Written originally by John Golden, my mathhombre.

The Focus and Directrix of a Parabola

This worksheet illustrates the relationship between a parabola and its focus and directrix. Move the yellow point along the parabola.
What is the red point called?
What is the red line called?
What is the relationship between the lengths of the blue line segments?
What fact does the previous question/answer demonstrate?

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