Trigonometric circle
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sin(0) = 0sin(PI/2 rad) = 1cos(0) = 1sin(a) = opp/hypcos(a) = adj/hyp (Trigo + Thales)if you know the cosine, you don't know the sign of the angle !u.v = 0 <=> (u,v) orthogonal, perpendicular (Maths)u.v <= epsilon <=> (u,v) orthogonal, perpendicular (Computing)(or u = 0, or v = 0 ...) |
Length of the perpendicular projection of v on u ??Length = u.v / || u || = (u/||u||).v |
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