While exploring this applet, consider the following questions:
1. In polar coordinates, r is the radius of a circle. What is the significance of r in rectangular coordinates?
2. Turn off rectangular coordinates, and move point A. Can you guess what the rectangular coordinates are?
3. Turn the rectangular coordinates back on, and turn the polar coordinates off.
Now, move point A. Can you derive the polar coordinates from the rectangular coordinates?
4. What is the relationship between the rectangular and polar coordinates?