CGAL 5.3  2D and 3D Linear Geometry Kernel

CGAL::angle()
Operations  
Angle  operator() (const Kernel::Vector_3 &u, const Kernel::Vector_3 &v) 
returns CGAL::OBTUSE, CGAL::RIGHT or CGAL::ACUTE depending on the angle formed by the two vectors u and v .  
Angle  operator() (const Kernel::Point_3 &p, const Kernel::Point_3 &q, const Kernel::Point_3 &r) 
returns CGAL::OBTUSE, CGAL::RIGHT or CGAL::ACUTE depending on the angle formed by the three points p , q , r (q being the vertex of the angle). More...  
Angle  operator() (const Kernel::Point_3 &p, const Kernel::Point_3 &q, const Kernel::Point_3 &r, const Kernel::Point_3 &s) 
returns CGAL::OBTUSE, CGAL::RIGHT or CGAL::ACUTE depending on the angle formed by the two vectors pq , rs . More...  
Angle  operator() (const Kernel::Point_3 &p, const Kernel::Point_3 &q, const Kernel::Point_3 &r, const Kernel::Vector_3 &v) 
returns CGAL::OBTUSE, CGAL::RIGHT or CGAL::ACUTE depending on the angle formed by the normal of the triangle pqr and the vector v .  
Angle Kernel::Angle_3::operator()  (  const Kernel::Point_3 &  p, 
const Kernel::Point_3 &  q,  
const Kernel::Point_3 &  r  
) 
returns CGAL::OBTUSE, CGAL::RIGHT or CGAL::ACUTE depending on the angle formed by the three points p
, q
, r
(q
being the vertex of the angle).
The returned value is the same as operator()(p  q, r  q)
.
Angle Kernel::Angle_3::operator()  (  const Kernel::Point_3 &  p, 
const Kernel::Point_3 &  q,  
const Kernel::Point_3 &  r,  
const Kernel::Point_3 &  s  
) 
returns CGAL::OBTUSE, CGAL::RIGHT or CGAL::ACUTE depending on the angle formed by the two vectors pq
, rs
.
The returned value is the same as operator()(q  p, s  r)
.