The centre and the radius Animation Play

The centre and the radius of a circle Student activity Play

The centre and the radius of a circle Simulation Play

The circle as a locus Animation Play

The circle with centre at an arbitrary point Whiteboard exercise Play

The concept of pH Student activity Play

The conversion graph Whiteboard exercise Play

The coordinates of a given point Simulation Play

The coordinates of the marked points Whiteboard exercise Play

The correctness of a construction Animation Play

The correctness of a construction Student activity Play

The cosine and coordinates of the points Animation Play

The cosine of an arbitrary angle Student activity Play

The cost of notebooks Whiteboard exercise Play

The cost of pencils Whiteboard exercise Play

The defects of lenses Student activity Play

The derivative of the function y = ln|x| at the point Whiteboard exercise Play

The derivative of the natural exponential function at the point Whiteboard exercise Play

The derivative of the natural logarithmic function at the point Whiteboard exercise Play

The distance between points A and B Animation Play

The distance between the centres of circles Student activity Play

The distance between the points Animation Play

The distance between two points in the plane Whiteboard exercise Play

The distance between two points in the plane Student activity Play

The distance formula Student activity Play