How Dr. Geo script is used to build a sketch with complex feedbacks.
The user is expected to construct given shapes, then Dr. Geo (with its script) will recognize the right from the wrong shapes.
Appropriate feedbacks are provided; colouring in red wrong shapes and in green the right ones; specific text feedback informs about the user progress.
A custom user interface is built to let young learners enjoy the activity without the whole Dr. Geo user interface overload.
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