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Angle entre rectes

L'angle entre dues rectes és el que formen els seus vectors directors (o el seu suplementari, si l'angle és obtús)

L'angle entre dos vectors és begin mathsize 12px style open parentheses stack stack bold v subscript bold 1 with bold rightwards harpoon with barb upwards on top bold comma stack bold v subscript bold 2 with bold rightwards harpoon with barb upwards on top with bold hat on top close parentheses bold equals bold acos fraction numerator stack bold v subscript bold 1 with bold rightwards harpoon with barb upwards on top bold times stack bold v subscript bold 2 with bold rightwards harpoon with barb upwards on top over denominator open vertical bar open vertical bar stack bold v subscript bold 1 with bold rightwards harpoon with barb upwards on top close vertical bar close vertical bar bold times open vertical bar open vertical bar stack bold v subscript bold 2 with bold rightwards harpoon with barb upwards on top close vertical bar close vertical bar end fraction end style

 
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