What is a Radian?
Interact with this app for a few minutes. Then answer the questions that follow.
A radian is another unit of angle measure (like degrees). Solely from what you've seen above (and without using Google), describe, in your own words, what it means for an angle to measure one radian.
We know a circle is a full arc that measures 360 degrees. From what you've seen, approximate the number of radians that make a full circle (revolution).