The perimeter of the triangle and the diameter of the big circle Animation Play

The period of the tangent Student activity Play

The periods of the sine and the cosine Student activity Play

The perpendicular bisector of a line segment – a reminder Student activity Play

The perpendicular bisectors Simulation Play

The properties of orbits Animation Play

The radius and the diameter of a circle Student activity Play

The radius of an orbit Animation Play

The radius of an orbit and the size of the atomic nucleus The radius of an orbit and the size of the atomic nucleus Whiteboard exercise Play

The radius of an orbit, the time of revolution and the velocity of a satellite Student activity Play

The radius of an orbit, the time of revolution and the velocity of a satellite Whiteboard exercise Play

The radius of the circle inscribed into the right triangle Whiteboard exercise Play

The radius of the Universe Illustration Play

The relationship between centripetal force and the radius of the circle Animation Play

The rolling wheel Whiteboard exercise Play

The running truck Whiteboard exercise Play

The Second Law of Thermodynamics Class activity Play

The Second Law of Thermodynamics Whiteboard presentation Play

The sensory (afferent) system of the peripheral nervous system Student activity Play

The skeleton Student activity Play

The skeleton and vital organs Animation Play

The small and the big circles Whiteboard exercise Play

The speed of the Moon Student activity Play

The speed of the Moon Whiteboard exercise Play

The square inscribed in a circle Whiteboard exercise Play