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If you are using the interactive, you can choose to see pieces which are already rotated. Click on the Settings menu (the purple cog in the top right-hand corner) and choose that option.
Where might be a good place to start?
Is there anywhere else you can put a piece straight-away?
How about trying to put in pieces from one of these starting points, filling gaps as you go along?
Vincent and Tara are making triangles with the class construction set. They have a pile of strips of different lengths. How many different triangles can they make?