A sphere is the set of points which are all within the same distance from a given point in space.
Colour a map with the fewest number of colours possible, so that no two adjacent regions have the same colour.
The Möbius strip and the Klein bottle are special two-dimensional surfaces with only one side.
This animation presents the formulas to calculate the perimeter and area of shapes as well as the surface area and volume of solids.
Calculating the volume of a sphere is possible using an appropriate cylinder and cone.
The sum of the volume of the ´tetrahedrons´ gives an approximation of the volume of the sphere.
This animation demonstrates geometric rotation, a type of geometric transformation both in plane and space.
Rotating a geometric shape around a line within its geometric plane as an axis results in a solid of revolution.