Perimeter, area, surface area and volume

This animation presents the formulas to calculate the perimeter and area of shapes as well as the surface area and volume of solids.

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Non-orientable surfaces

The Möbius strip and the Klein bottle are special two-dimensional surfaces with only one...

The reflection of a point across an axis

Axis t and point P are given. Let’s plot the mirror image (point P’) of point P across axis t.

Weighing the Pythagorean theorem

In this experiment we provide proof of the well-known theorem of Pythagoras with a scale.

Net of a cube (exercises)

Not all nets consisting of 6 congruent squares are foldable into cubes.

Plotting an angle bisector

In this video, we plot the angle bisector of a given alpha angle.

Grouping of solids 4

This animation demonstrates various groups of solids through examples.


A cuboid is a polyhedron with six rectangular faces.

Plotting a perpendicular on a line from a point P that is not on the line

Both line e and point P, which is not situated on line e, are given. Let’s plot line g such that...

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