Solve problems related to radians and arc length like finding an arc length given the central angle and radius. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Here is a site that clearly and thoroughly explains arc length and its relationship to radian measure of angles. There are example problems solved, problems for the student to attempt, and answers to the student problems. Point this site...

After demonstrating how to find arc length and sector area using radian measures, student can practice the concepts with the examples provided and play an interactive game involving angular velocity.

[Free Registration/Login may be required to access all resource tools.] Define Radian Measure and Critical Angles in Radians.

[Free Registration/Login may be required to access all resource tools.] Definition and measurement of an arc on a circle,

Concepts in Trigonometry are explained and illustrated here by a member of the math department at Borough of Manhattan Community College.