There are 33 NRICH Mathematical resources connected to Regular polygons and circles, you may find related items under Angles, Polygons, and Geometrical Proof.Broad Topics > Angles, Polygons, and Geometrical Proof > Regular polygons and circles
This problem is intended to get children to look really hard at something they will see many times in the next few months.
These pictures were made by starting with a square, finding the half-way point on each side and joining those points up. You could investigate your own starting shape.
What shape is the overlap when you slide one of these shapes half way across another? Can you picture it in your head? Use the interactivity to check your visualisation.
The red ring is inside the blue ring in this picture. Can you rearrange the rings in different ways? Perhaps you can overlap them or put one outside another?
Can you fill in the empty boxes in the grid with the right shape and colour?
Use the isometric grid paper to find the different polygons.
Sally and Ben were drawing shapes in chalk on the school playground. Can you work out what shapes each of them drew using the clues?
The ancient Egyptians were said to make right-angled triangles using a rope with twelve equal sections divided by knots. What other triangles could you make if you had a rope like this?
What happens if you join every second point on this circle? How about every third point? Try with different steps and see if you can predict what will happen.
How many different shaped boxes can you design for 36 sweets in one layer? Can you arrange the sweets so that no sweets of the same colour are next to each other in any direction?
Investigate the different shaped bracelets you could make from 18 different spherical beads. How do they compare if you use 24 beads?
How could you find out the area of a circle? Take a look at these ways.
What shape and size of drinks mat is best for flipping and catching?
If these balls are put on a line with each ball touching the one in front and the one behind, which arrangement makes the shortest line of balls?
An environment that enables you to investigate tessellations of regular polygons
Are all the possible combinations of two shapes included in this set of 27 cards? How do you know?
A very mathematical light - what can you see?
A cheap and simple toy with lots of mathematics. Can you interpret the images that are produced? Can you predict the pattern that will be produced using different wheels?
Investigate these hexagons drawn from different sized equilateral triangles.
Learn how to draw circles using Logo. Wait a minute! Are they really circles? If not what are they?
This is the second in a twelve part introduction to Logo for beginners. In this part you learn to draw polygons.
Look at the mathematics that is all around us - this circular window is a wonderful example.
Can you reproduce the Yin Yang symbol using a pair of compasses?
This article for pupils gives some examples of how circles have featured in people's lives for centuries.
Read all about the number pi and the mathematicians who have tried to find out its value as accurately as possible.
Make an estimate of how many light fittings you can see. Was your estimate a good one? How can you decide?
What shaped overlaps can you make with two circles which are the same size? What shapes are 'left over'? What shapes can you make when the circles are different sizes?
Use the interactivity to make this Islamic star and cross design. Can you produce a tessellation of regular octagons with two different types of triangle?
This LOGO challenge starts by looking at 10-sided polygons then generalises the findings to any polygon, putting particular emphasis on external angles
Can you use LOGO to create this star pattern made from squares. Only basic LOGO knowledge needed.
Can you cut a regular hexagon into two pieces to make a parallelogram? Try cutting it into three pieces to make a rhombus!
Draw three straight lines to separate these shapes into four groups - each group must contain one of each shape.
This investigation explores using different shapes as the hands of the clock. What things occur as the the hands move.