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  1. wateryfield
    Guys. Help me a trigonometric functions problems, i have to calculation the angle of the polygon. The expression angle = acos (dot(N(V1),N(V2))) can't get the degrees great than 180, i have a polygon interior angle great than 180. How can i judge when negative the angle, I totally forget the dot product principle. Thanks. angle_between_vectors.hip
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