Recording of analogue and digital signals Animation Play

Rectangles Student activity Play

Reduction formulas due to periodicity Student activity Play

Reduction formulas due to periodicity Whiteboard exercise Play

Reflection symmetry in the coordinate system in the line y = x Student activity Play

Reflection symmetry in the coordinate system in the line y = –x Student activity Play

Reflection symmetry in the coordinate system in the lines x = a and y = b Student activity Play

Reflection symmetry in the coordinate system in the x-axis and the y-axis Student activity Play

Reflection symmetry of a figure in the coordinate system Whiteboard exercise Play

Reflex responses of the nervous system Class activity Play

Reflex responses of the nervous system Whiteboard presentation Play

Relationship between the group number and the number of valence electrons Animation Play

Relationship between the period of revolution and the orbital radius Illustration Play

Relative atomic mass Class activity Play

Relative atomic mass Whiteboard presentation Play

Relatively prime numbers Whiteboard exercise Play

Reproductive system - parts and functions Whiteboard exercise Play

Responses of the autonomic nervous system to changes in the external environment Student activity Play

Responses of the autonomic nervous system to the internal environment Student activity Play

Reversing the percentage change Student activity Play

Right- and left-handed coordinate systems Animation Play

Road in the coordinate system Animation Play

Rocky planet Chart Play

Rocky planets and gas giants Whiteboard exercise Play

Role of smell in animals Slideshow Play