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This picture is taken from the Problem Pictures Themes resource of photographs with activities for mathematics teaching.
If you purchase this resource the photographs are available in higher resolution and there are additional pages containing hints and solutions.
Hoberman sphere
When it arrives in its box, the Hoberman sphere measures 240 mm across. Opened up, it grows to 830 mm, large enough to crawl inside.
How many coloured circles are there? Going around one circle, how many times does it touch other circles? What shapes are on the surface of the sphere? How many of each shape?
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