The four angles Whiteboard exercise Play

The hexagon and the square Whiteboard exercise Play

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 keyhole Whiteboard exercise Play

The line and the circle Student activity Play

The measure of an inscribed angle Whiteboard exercise Play

The measure of the angles Whiteboard exercise Play

The missing angles in the polygon Whiteboard exercise Play

The missing exterior angles Whiteboard exercise Play

The most famous star Animation Play

The polygon made of two triangles Whiteboard exercise Play

The radius of the circle inscribed into the right triangle Whiteboard exercise Play

The shapes that are polygons Whiteboard exercise Play

The shortest possible perimeter Animation Play

The square inscribed in a circle Whiteboard exercise Play

The square inscribed in a circle Animation Play

The sum of the angles in a polygon Whiteboard exercise Play

The sum of the angles in a polygon Student activity Play

The sum of the angles in an octagon Whiteboard exercise Play

The sum of the angles in the polygons Whiteboard exercise Play