Touch the 1 and drag to make a rectangle. Its area is the number. Tap Fix to hold it; tap Fixed to let go.

Turn the dial to cut each metre into smaller pieces. Every way to make the number at that cut appears, one rectangle at a time. Tap the plane to pause; tap again to go on. Tap Every cut to try every cut up to the one on the dial.

Tap a label, like , to watch the glass cut into tiles and put back together.

The numbers in the key count the ways. Turn a dot off to count without it.

Tap Near or Whole to change the view. Pinch to zoom. Tap Mirror to see all four quarters.

Pan and pinch until the plane shows what you want, then tap Share. Choose Labels, Grid lines or Axes if you want them in the picture.

Tap Join to connect the corners, and Fill to fill the rectangles. Tap Color, choose a colour, then tap a row of the key.