Property of a perpendicular bisector Animation Play

Pythagorean theorem in 3-dimensional space Whiteboard exercise Play

Pythagorean theorem in 3-dimensional space Student activity Play

Pythagorean triples Student activity Play

Quantities of the same kind Student activity Play

Radiation of solids Student activity Play

Radii of three circles Whiteboard exercise Play

Radioactive decay Student activity Play

Radioactivity Student activity Play

Radioactivity Animation Play

Ratio of two quantities of different kinds Whiteboard exercise Play

Ratio of two quantities of different kinds Whiteboard exercise Play

Ratio of two quantities of different kinds Student activity Play

Ratio of two quantities of the same kind Simulation Play

Ratio of two quantities of the same kind Whiteboard exercise Play

Ratio of two quantities of the same kind Student activity Play

Ratios of sides in a triangle Animation Play

Rectilinear motion and circular motion Animation Play

Reflecting telescopes Animation Play

Reflecting telescopes Whiteboard exercise Play

Reflecting telescopes Student activity Play

Relationship between the electromagnetic force and the length of a conductor Student activity Play

Relationship between the electromagnetic force and the length of a conductor Whiteboard exercise Play

Relationship between the electromagnetic force and the length of a conductor Slideshow Play

Reliability of demonstration Animation Play