The Equation of a Circle

Angles Formed Outside a Circle

Special Segments in a Circle

The Tangent–Chord Angle

Tangents to a Circle

Two Chords Meeting Inside a Circle

Central Angles and their Arcs

The Circle

Line and Rotational Symmetry

Arcs and Chords

Rotation about a Fixed Point

Composition of Translation and Reflection

Reflection over a Line

Translation

Parallel Lines and Proportional Parts

The Triangle Midsegment Theorem

The Angle Bisector Theorem

Special Segments in Similar Triangles

Similarity of Triangles

Similar Polygons