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Hello,
When applying a rotation to some object, GeoGebra consider the angles in radians, (e. g: rotate(B, 90) why is that? Although I have set the angle unit to degrees in Preferences > Advanced > Angle unit > Degrees.
The same question 
the angle without "°" is in radians.
the angle with "°" is in degrees.
(e. g: rotate(B, 90) is in radians, independent of preferences
(e. g: rotate(B, 90°) is in degree independent of preferences
"Preferences > Advanced > Angle unit" determines how the angular dimension is to be displayed (independent how the angular dimension was entered/defined)
the angle without "°" is in radians.
the angle with "°" is in degrees.
(e. g: rotate(B, 90) is in radians, independent of preferences
(e. g: rotate(B, 90°) is in degree independent of preferences
"Preferences > Advanced > Angle unit" determines how the angular dimension is to be displayed (independent how the angular dimension was entered/defined)
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