A circular arc Student activity Play

A perpendicular through a point off the line Simulation Play

A perpendicular through a point off the line Student activity Play

A perpendicular through a point on the line Student activity Play

A perpendicular through a point on the line Simulation Play

An angle congruent to a given one Whiteboard exercise Play

An angle congruent to a given one Student activity Play

Angle bisector Animation Play

Angle bisector Student activity Play

Atoms, nucleons and electrons Student activity Play

Atoms, nucleons and electrons Animation Play

Atoms, nucleons and electrons Whiteboard exercise Play

Building a demonstration from a proof Student activity Play

Building a demonstration from a proof Whiteboard exercise Play

Chords and diameters Simulation Play

Chords and diameters Student activity Play

Circle circumscribed about a quadrilateral Animation Play

Common polygons Student activity Play

Congruent triangles Simulation Play

Congruent triangles Student activity Play

Constructing a congruent angle Animation Play

Constructing a line parallel to a given line Simulation Play

Constructing a perpendicular bisector Simulation Play

Constructing a perpendicular to a given line Simulation Play

Constructing a perpendicular to line at a point off the line Simulation Play