Circles
Circles covers terms and formulas, including central and inscribed angles, and the relationships between tangents, arcs, secants, chords and circumference.
Locus and Definition of a Circle and Sphere
Central Angles and Intercepted Arcs
Chords and a Circle's Center
Radii to Tangents
Tangent Segments to a Circle
Inscribed Angles
Angles in Semicircles and Chords to Tangents
Cyclic Quadrilaterals and Parallel Lines in Circles
Circumference
Arc Length
Secants