Make a cube out of straws and have a go at this practical
Reasoning about the number of matches needed to build squares that
share their sides.
How can the same pieces of the tangram make this bowl before and after it was chipped? Use the interactivity to try and work out what is going on!
The other set form a sea wall (figures
4 and 5), which I guess is designed to absorb some of the force of
the waves as they hit the wall.
My ideas about their purpose is
guesswork so if there are some engineers amongst you that want to
write an article to explain what is happening for us, we will look
on it with great interest!
What is not obvious is that the two
structures seem to be made from linking together a large number of
pieces, all the same, but designed to interlock, for strength and
also to make it easy to build. I have not seen anything like this
anywhere else, let alone seen it constructed, but I guess lorry
loads of enormous concrete pieces were brought to the sea shore and
then fitted together (a bit like a daisy chain or clicking together
Can you work out what a basic shape
might be in both cases and work out a way they might fit together?
You might try something out with pipe cleaners or Lego bricks or
something similar. If you cannot work out what is happening here
you might be able to create similar interlocking structures of your
own. If you have any really good ideas and can put them together
into an article for others to read - we would be delighted to hear
And one more for luck (my