Radar Animation Play

Radiation Whiteboard exercise Play

Radiation Student activity Play

Radiation of heat Student activity Play

Recording of analogue and digital signals Animation 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 Whiteboard presentation Play

Reflex responses of the nervous system Class activity Play

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

Renewable and non-renewable sources of energy Whiteboard exercise Play

Renewable and non-renewable sources of energy Student activity Play

Renewable energy resources Student activity 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

Right- and left-handed coordinate systems Animation Play

Road in the coordinate system Animation Play

Roasting turkey Animation Play

Rocky planet Chart Play