[This is all so fascinating. The girl can't see them, and she seems to just be accepting the fact that a pencil appeared next to her, just picks it up and tell herself okay, from the beginning and starts to work out this proof.

Elsa watches without interrupting as the girl takes it step by step until she reaches the solution; then, reaching for the book with the answer key, she checks the solution and nods at the girl, who has had such a rough time of it that she's doubting herself.]

Good job, that's right! See? You know what to do. You just need to trust yourself and take it one step at a time. Now, how about you figure out the sum of the angles in a heptagon? Time yourself. This is something you can get quick at very easily.