Introduction to radians

5 videos
1 skill
Learn about radians, which are the official unit of measurement for angles in algebra (in contrast to degrees, which are used in geometry).

Intro to radians

VIDEO 10:51 minutes
Sal explains the definition and motivation for radians and the relationship between radians and degrees.

Radians & degrees

VIDEO 7:12 minutes
Sal discusses the general approach to converting between radians and degrees and vice versa.

Degrees to radians

VIDEO 7:02 minutes
Sal converts the degree measures 150° and -45° to radians.

Radians to degrees

VIDEO 3:20 minutes
Sal converts the radian measures π and -π/3 to degrees.

Radians & degrees

PRACTICE PROBLEMS
Convert angle measures given in degrees to radians and vice versa.

Radian angles & quadrants

VIDEO 3:51 minutes
Sal determines the quadrant at which a ray falls after a rotation by a certain measure of radians.