Shmoop (Learning Guide): Circles
Shmoop (Video): Area of Sectors
Regents Prep (Lesson): Sectors
Regents Prep (Practice): Working with Sectors
Math is Fun: Circle Sectors and Segments
Online Textbook (Video #2): Finding Length of an Arc
Online Textbook (Quiz): Circumference and Arc
Online Textbook (Video #2): Finding the Area of a Segment
Online Textbook (Quiz): Area and Sectors
Online Practice Quiz: Circumference and Arc Length
Online Practice Quiz: Area of Circles and Sectors