Now, more than 122 years after it was first proposed, Kamata and two other mathematicians have finally proved that a solution ...

The interior angles in a triangle always add up to 180º. An equilateral triangle has 3 sides of equal length. The dashes on the lines show they are equal in length. All of the angles are also equal.

Here is the net of a triangular prism. Why not see how much you know about this topic already? Then complete the page and see if you can beat your score. A polygon is a flat shape with straight sides.

Department of Electrical Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR 999077, China ...