Regular square pyramid

A regular square pyramid is a right pyramid with a square base and four triangular faces.

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Császár polyhedron

The Császár polyhedron is a nonconvex polyhedron with 14 triangular faces.

Sophie´s desk

A game about the different views of complex objects.

Platonic solids

This animation demonstrates the five regular three-dimensional (or Platonic) solids, the...

Plotting a 45° angle

By bisecting a straight angle (180°), we get a right angle (90°). We get a 45° angle by...

The Cartesian and the polar coordinate system

Practise how to define a specific location using coordinate systems.

Reflecting a line segment across an axis

Axis t and line segment AB are given on a plane. Let’s plot the mirror image of line segment AB...

Surface area of spheres (demonstration)

The surface of a sphere consists of the set of points which are all at the same distance...

Angle of inclination of lines and planes

This animation demonstrates the angle of inclination of lines and planes in various...

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