CGAL users discussion list

["Max" <>]

>Hello,
>I want to get the angle value between three points but I only find the angle
>function that returns only the type of the angle.
>I would like to know if there is another function to help in this task.
>
try this

Point p1, p2, p3;
Vector v1 = p1-p2;
v1 = v1 / std::sqrt( v1 * v1);
Vector v2 = p3-p2;
v2 = v2 / std::sqrt( v2 * v2);

double angle = std::acos( v1 * v2 ) / CGAL_PI * 180;

any pre-condition checking code is omitted here.

B/Rgds
Max