fitting polygons together

octagon loops, produced using the Tyler applet

enables polygons to be drawn (and removed) easily


what is the relationship between the inside and outside perimeter of these octagon loops?

some interesting patterns can be formed











for example, the semi-regular tesselations could be explored

The illuminations (NCTM) polygon fitter is also good. Using this you can group blocks of polygons.

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)