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The Third Dimension

Age 5 to 11 Challenge Level:

Here are four cubes joined together:
 
three cubes joined horizontally with one joined at left end on top
 
We can draw this arrangement of cubes on dotty paper (isometric paper) which gives us a way of drawing 3D objects more easily:
 
isometric grid showing arrangement of cubes above
 
How many other arrangements of four cubes can you find?
Can you draw them on dotty paper? It's more difficult than it looks!
If you don't have any isometric paper, click here.