1. What is similar between all of these?

2. And these?

3. Angular Velocity Centripetal Acceleration Examples of Circular Motion

4. Circular Motion means that the size of the object traveling in the circle is negligible with the radius of the orbit.

5. Measuring an angle Definition of an angle
Angle = arc length ÷ radius of arc
Θ = s ÷ r
Unit: radian

6. Measuring an angle Definition of a radian
One radian is the angle measured from the center of the circle when the arc length is the same as the radius of the arc

7. Measuring an angle Proof that θ = 2π
Conversion between radians and degrees.