# Horizontal and Vertical Stretches of the ELLIPSE

**GeoGebra ELLIPSE Activity**The graph below is that of x^2/a^2 + y^2/b^2 = 1. You are going to explore the effect of "a" and "b" by adjusting the sliders. - What does increasing / decreasing "a" do to the shape of the graph? - What does increasing / decreasing "b" do to the shape of the graph? - What happens when a = b? - Set a=3. How can we identify that value of "3" by studying the graph?

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