four peice tangram

hopefully you'll be better at these puzzles than me...

nrich resources

nrich helpfully give a 4 digit code to their resources
ou can find these resources by searching for nrich then the code










4348 cuisenaire rods

5618 dotty circle sine function, from a point going round a circle

2883 virtual geobaords (square, circle, isometric)

4901 large pinboard

2667 tilted square (coordinates of skew squares)

6703 mystic rose drawing tool, for various divisions of a circle, useful for creating a rule for the numbers of diagonals - with a focus on proving a generalisation
(you can also download an Excel tool for this from Bodmas.)

5528 tangram (square)