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You'll need to print off these triangles to cut out. You could cut them out of tissue paper or overhead transparencies if you want to investigate overlaps.
What makes a 'jewel shape' different from one of the shapes in the first group, do you think?
It's good to talk about what others see in the designs you've made. Sometimes they will see shapes you may not have noticed.
Is there a best way to stack cans? What do different supermarkets do? How high can you safely stack the cans?