8 steps

Step 1: A square is drawn on a sheet of paper. Of course, all its angles are equal to each other.

Step 2: Can you pull out one of the corners, while expanding the other two?

Step 3: No, no, this does not have to stretch the paper. You need to change angles only visually.

Step 4: Have you already tried? Let's see how it could be done!

Step 5: You see - with the help of broken lines we visually reduced one corner, and two - increased.

Step 6: This problem can also be represented in the reverse order.

Step 7: Show your friends a square, drawn by broken lines (only not on a sheet in a cage). And ask them to choose the largest and smallest corners.

Step 8: Or just ask if the angles are equal or not.

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