Regular polygons – the square Student activity Play

Relative abundance of isotopes and mass spectra Student activity Play

Roentgen spectra of elements – characteristic radiation Student activity Play

Roentgen spectra of elements – characteristic radiation Whiteboard exercise Play

Ruler-and-compass constructions Class activity Play

Ruler-and-compass constructions Whiteboard presentation Play

Satellite television Student activity Play

Satellite television Slideshow Play

Sense and line of direction of the velocity vector Animation Play

Set of points in a coordinate system Student activity Play

Set of points in a coordinate system Whiteboard exercise Play

Sides of a line Whiteboard exercise Play

Sides of a line Student activity Play

Sides of the triangles Animation Play

Similar functions – similar graphs Whiteboard exercise Play

Similar functions – similar graphs Student activity Play

Simplified formula for Pearson's coefficient Student activity Play

Simultaneous equations Class activity Play

Simultaneous equations Whiteboard presentation Play

Slope of a line Student activity Play

Slope of a line Whiteboard exercise Play

Solving equations using graphs Whiteboard presentation Play

Solving equations using graphs Class activity Play

Solving linear equations in two variables Student activity Play

Solving linear inequalities Student activity Play