in case of angle between two lines it will never give a number between 0 and 90
It does :)
You probably set your angle default unit as radians.
In version 5, select the wheel icon, then select Advanced, and in the appearing panel set the Angle Unit as Degrees.
In version 6 / apps, select the menu icon (three small stacked lines), then Settings.
Select the last icon from top right (the one related to the Algebra View) and in the appearing panel select Degree as Angle Unit)
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