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Table 1 Example of student’s answers by means ISQ

From: A scaffolding toolkit to foster argumentation and proofs in mathematics: some case studies

Erika’s free arguments

A B C D is a parallelogram because it has two parallel sides

A E C D is a trapezoid because it has two parallel sides and two oblique sides.

Erika’s formal proof

A B C D is a parallelogram because it has opposite parallel sides

A E C D is a trapezoid by Def. 2a