Answers to your questions

Dear Giulia

Yes, I'm much better. Thank you for your concern.
About your questions:

1. In activity one you need to explain briefly the history of tangrams, and you should have noticed already that there aren't clear records about that, only legends. you don't need at this point explain details of the shapes.

2. In activity two, it is time for you to detail as much as possible your shapes.

3. In the last activity, you again don't need to explain about your shapes, just create a story that will cativate the kids.

I hope it helped you.

Mrs. Saatkamp