The interior angle of a regular polygon Student activity Play

The interior angle of a regular polygon – proof (1) Animation Play

The interior angle of a regular polygon – proof (2) Animation Play

The interior angles of a polygon Student activity Play

The interior angles of an n-sided polygon Whiteboard exercise Play

The interior angles of polygons Whiteboard exercise Play

The measure of the angles Whiteboard exercise Play

The sum of the exterior angles of a convex polygon Student activity Play

The sum of the exterior angles of a hexagon Whiteboard exercise Play

The sum of the exterior angles of a pendecagon Whiteboard exercise Play

The sum of the interior angles in the polygons Whiteboard exercise Play

The sum of the interior angles of a quadrilateral – proof Animation Play

Theorem – assumptions and claim Whiteboard exercise Play

Theorem – assumptions and claim Student activity Play

Theorems and their assumptions in geometry Whiteboard exercise Play

Theorems and their assumptions in geometry Student activity Play