Video: Circles: Radius, Diameter and Circumference

Video: Area of a Circle

Video: Inscribed and Central Angles

Video: Perpendicular Radius Bisects Chord

Video: Right Triangles Inscribed in Circles (Proof)

Video: Area of Inscribed Equilateral Triangle (some basic trig used)

Practice with ARCS:

Circles and arcs Relate the length of an arc to the circumference of a whole circle.

Areas of circles and sectors Relate the area of a sector to the area of a whole circle.

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