The length of the arc Whiteboard exercise Play

The length of the arc Animation Play

The line and the circle Student activity Play

The measure of an inscribed angle Whiteboard exercise Play

The medieval octagon Animation Play

The method of 'halving the arcs' Whiteboard exercise Play

The number of arcs Whiteboard exercise Play

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

The points on the circumference of a circle Whiteboard exercise Play

The polygonal arc Whiteboard exercise Play

The reflex arc and medicine Illustration Play

The withdrawal reflex – an example of an unconditioned reflex Animation Play

Theorem – assumptions and claim Student activity Play

Theorem – assumptions and claim Whiteboard exercise Play

Three circles Student activity Play

Three circles – finding the arcs Whiteboard exercise Play

Unconditioned reflexes Student activity Play