# A squashed Astroid as an Envelope

In the applet below the radius of the orange circle is and the radius of the blue circle is . One point is moving clockwise along the blue circle and another point is moving counterclockwise along the orange circle. The envelope of the lines passing through these points is a squashed astroid.

- Drag the slider to change the radius of the blue circle.
- Show the graph of the (non-squashed) astroid.
- What happens when the radius
increases?

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