The second tangent theorem Animation Play

The second tangent theorem – equality in length Student activity Play

The set of commands Whiteboard exercise Play

The sides of isosceles triangles Student activity Play

The sides of the triangles – trigonometric ratios for selected angles Whiteboard exercise Play

The signs of the trigonometric functions Student activity Play

The signs of trigonometric functions – clockwise turn Whiteboard exercise Play

The sine of an arbitrary angle Student activity Play

The sine of an arbitrary angle Whiteboard exercise Play

The sine rule (the law of sines) Student activity Play

The sine – reducing angles Whiteboard exercise Play

The sine – reducing angles Student activity Play

The size of the angles Whiteboard exercise Play

The smallest positive coterminal angle Whiteboard exercise Play

The strength of carbon–carbon bond Animation Play

The strength of the bond Animation Play

The structure of alkanes (1) Student activity 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 a quadrilateral Simulation Play

The sum of the angles in a triangle Animation Play

The sum of the angles in an octagon Whiteboard exercise Play

The sum of the angles in the polygons Whiteboard exercise Play

The sum of the angles in the quadrilateral Whiteboard exercise Play

The sum of the angles in the triangle Animation Play