"Vectorial angle" is not a standard term in mathematics. The angle between two vectors v and w is defined as the value theta such that w dot v = v times w times cosine theta. Definitions:
w and v are vectors (ordered lists of numbers) of the same dimension n (i.e. both contain n terms).
The jth term in w is denoted wj (similarly for v)
w dot v = w1v1 + w2v2 +... + wnvn
w = square root of w dot w (similarly for w)
We always choose theta to be between 0 and pi (i.e. between 0 and 180 degrees), including 0 and pi as possible values of course. If w is a positive multiple of v, theta will be zero. If w is a negative multiple of v, theta will be pi.
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Right angle, obtuse angle, acute angle, supplementary angle, complementary angle, interior angle, exterior angle, adjacent angle
The angle of incidence
the angle of incidence is the initial ray angle and the angle of reflection is the reflected ray angle
It is a reflex angle
reflex angle!