Plex lets you specify a mapping between points and their images.
Then you can draw and see the transformed image.
A gallery of beautiful photos of cast ironwork friezes in Australia with a mathematical discussion of the classification of frieze patterns.
Some local pupils lost a geometric opportunity recently as they surveyed the cars in the car park. Did you know that car tyres, and the wheels that they on, are a rich source of geometry?
Proofs that there are only seven frieze patterns involve complicated group theory. The symmetries of a cylinder provide an easier approach.
See the effects of some combined transformations on a shape. Can
you describe what the individual transformations do?
Does changing the order of transformations always/sometimes/never
produce the same transformation?
Sort the frieze patterns into seven pairs according to the way in
which the motif is repeated.
How many different transformations can you find made up from
combinations of R, S and their inverses? Can you be sure that you
have found them all?
This article describes the scope for practical exploration of tessellations both in and out of the classroom. It seems a golden opportunity to link art with maths, allowing the creative side of your. . . .
This problem explores the shapes and symmetries in some national flags.
What is the missing symbol? Can you decode this in a similar way?
I took the graph y=4x+7 and performed four transformations. Can you
find the order in which I could have carried out the
Investigate what happens to the equations of different lines when
you reflect them in one of the axes. Try to predict what will
happen. Explain your findings.
This article describes a practical approach to enhance the teaching
and learning of coordinates.
Patterns that repeat in a line are strangely interesting. How many types are there and how do you tell one type from another?
What are the coordinates of this shape after it has been
transformed in the ways described? Compare these with the original
coordinates. What do you notice about the numbers?
Can you place the blocks so that you see the relection in the picture?
These clocks have been reflected in a mirror. What times do they
Can you draw the shape that is being described by these cards?
What happens to these capital letters when they are rotated through
one half turn, or flipped sideways and from top to bottom?
How will you decide which way of flipping over and/or turning the grid will give you the highest total?
Why not challenge a friend to play this transformation game?
Numbers arranged in a square but some exceptional spatial awareness probably needed.
A challenging activity focusing on finding all possible ways of stacking rods.
Can you recreate this Indian screen pattern? Can you make up
similar patterns of your own?
How many different symmetrical shapes can you make by shading triangles or squares?
A shape and space game for 2,3 or 4 players. Be the last person to be able to place a pentomino piece on the playing board. Play with card, or on the computer.
This article for teachers suggests ideas for activities built around 10 and 2010.
Try this interactive strategy game for 2
How many different ways can you find of fitting five hexagons
together? How will you know you have found all the ways?
Explore the effect of reflecting in two parallel mirror lines.
Explore the effect of reflecting in two intersecting mirror lines.
In how many ways can you fit all three pieces together to make
shapes with line symmetry?
In how many ways can you stack these rods, following the rules?
Can you explain why it is impossible to construct this triangle?
Where can you put the mirror across the square so that you can still "see" the whole square? How many different positions are possible?
Which times on a digital clock have a line of symmetry? Which look
the same upside-down? You might like to try this investigation and