Exploring Radian Measure

Move the Change angle slider. What do you notice?
How many radii can you fit halfway around the circle?
Change the radius of the circle by moving the r=1 slider. Then move the Change angle slider to see how many radii can fit halfway around the circle. What do you notice?
What number is used often in mathematics that is a little more than 3?
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Information: Exploring Radian Measure