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[mahdavi <>]

hi,all
I have a array of spheres ,and   follow error occured  in  an assignment .
error is 
:://////////////////////////////////////////////////////////////////////
: error C2440: '=' : cannot convert from 'CGAL::Null_functor::result_type'
to 'double'
///////////////////////////////////////////////////////////////////////////.
my code is:
/////////////////////////////////// code:
std::vector<K::Sphere_3>::iterator is=points1.begin();
float   radius;
radius=sqrt(is->squared_radius());
//////////////////////////////////////////////////
whether someone could guidance  me ? Thank you.

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