Two polygons fit together so that the exterior angle at each end of their shared side is 81 degrees. If both shapes now have to be regular could the angle still be 81 degrees?

Make five different quadrilaterals on a nine-point pegboard, without using the centre peg. Work out the angles in each quadrilateral you make. Now, what other relationships you can see?

Thinking of circles as polygons with an infinite number of sides - but how does this help us with our understanding of the circumference of circle as pi x d? This challenge investigates. . . .

Explain how the thirteen pieces making up the regular hexagon shown in the diagram can be re-assembled to form three smaller regular hexagons congruent to each other.

What shape and size of drinks mat is best for flipping and catching?

Find the ratio of the outer shaded area to the inner area for a six pointed star and an eight pointed star.

This LOGO challenge starts by looking at 10-sided polygons then generalises the findings to any polygon, putting particular emphasis on external angles

This is the second in a twelve part introduction to Logo for beginners. In this part you learn to draw polygons.

Given a 2 by 2 by 2 skeletal cube with one route `down' the cube. How many routes are there from A to B?

An environment that enables you to investigate tessellations of regular polygons

Follow instructions to fold sheets of A4 paper into pentagons and assemble them to form a dodecahedron. Calculate the error in the angle of the not perfectly regular pentagons you make.