Radian Measure - Definition
Where,
s = arc length
r = radius
Where,
s = arc length
r = radius
Rearrange the arc length formula to find an equation for s/r. This is the radian measure, defined as the ratio of the arc length to the radius.
Adjust the angle slider to change the angle measure. What do you notice about the radian measure for each angle?
Adjust the angle measure. What is true about the value of the arc length (s) divided by the radius (r)?
How does this relate to circle similarity?