the best angle is "45 degree"
because the air speed coming out of the fan is giving by this equation
V=v.tanθ
were : V: air speed,,, v: is the blades speed
and we got the maximum of the speed by making the angle 45
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A right angle
The angle of incidence is the angle of which it item is reflected, this leads us on to the fact that the angle of incidence will always be the same as the angle of reflection.
(The set of all points equidistant from the two sides of the angle. :)
Well since an acute angle is everything with a smaller degree than a right angle, there is no perfect acute angle. However, to demonstrate an acute angle, i would go with around a 20-25 degree angle.
obtuse