**Title:** Interactive Graph of an Ellipse

**Description:**
This is an interactive graph of an ellipse. Features include sliders which can be moved to change the coordinates of the foci to explore changes in eccentricity and the lengths of major and minor axes.

**Standard(s): **

[MA2013] PRE (9-12) 15: Create graphs of conic sections, including parabolas, hyperbolas, ellipses, circles, and degenerate conics, from second-degree equations. (Alabama)

[MA2013] PRE (9-12) 37: (+) Derive the equations of ellipses and hyperbolas given the foci, using the fact that the sum or difference of distances from the foci is constant. [G-GPE3]

[MA2013] ALT (9-12) 28: Create graphs of conic sections, including parabolas, hyperbolas, ellipses, circles, and degenerate conics, from second-degree equations. (Alabama)

[MA2013] AL2 (9-12) 28: Create graphs of conic sections, including parabolas, hyperbolas, ellipses, circles, and degenerate conics, from second-degree equations. (Alabama)