3. 4.1 Radian and Degree Measure
Parts of every angle:
Initial Side (ray)
Terminal Side (ray)
Vertex
Standard Position:
Initial side on the _______
Vertex on the _______
+ angles: ________
– angles: ________
3
5. Radians Video
A radian is the measure of a central angle
that intercepts an arc equal in length to the
radius of the circle.
How many radians in 1
full circle?
5