How to stretch an angle
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.