This geometry video tutorial provides a basic introduction into circles. It explains how to calculate the area of a circle as well as the circumference of a circle. It also explains how to calculate the arc length of a sector as well as the area of a sector in a circle. it explains the difference between the radius, chord, and diameter of a circle. It mentions how to calculate the inscribed angle as well as the measure of the intercepted arc. It discusses how to calculate the area of the shaded region given a right triangle inscribed in a circle. Circles - Area, Circumference, Radius: Circles - Chords, Radius, & Diameter: Lines, Rays, Line Segments, & Angles: 2 Column Proofs - Cong. Segments: Triangle Congruence - SSS, SAS, ASA: Central Angles and Circle Arcs: ___________________________________ Tangent Lines and Secant Lines: Circles - Central and Inscribed Angles: Tangent Tangent Angle Theorems: Inscribed and Circumscribed Polygons: Power Theorems - Chords, Secants, & Tangents: Circle Theorems: _________________________________ Two Column Proofs With Circles: Circles Review - Geometry: Incenter, Circumcenter, and Orthocenter: Distance Between Point and Line in 2D & 3D: Area of a Triangle With Vertices: ________________________________ Coordinate Geometry: Geometry Review - Study Guide: Geometry Final Exam Review: Final Exams and Video Playlists: Full-Length Videos and Worksheets: