\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.8 - 2D and 3D Linear Geometry Kernel

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Kernel::ComputeSquaredRadius_2 Concept Reference
Kernel Function Object Concepts

## Definition

Refines:
  `AdaptableFunctor` (with one argument)

See Also
  `CGAL::Circle_2<Kernel>`
  `CGAL::squared_radius()`

## Operations
A model of this concept must provide:
Kernel::FT | operator() (const Kernel::Circle_2 &c)
| returns the squared radius of `c`.
Kernel::FT | operator() (const Kernel::Point_2 &p, const Kernel::Point_2 &q, const Kernel::Point_2 &r)
| returns the squared radius of the circle passing through `p`, `q` and `r`. More...
Kernel::FT | operator() (const Kernel::Point_2 &p, const Kernel::Point_2 &q)
| returns the squared radius of the smallest circle passing through `p`, and `q`, i.e. one fourth of the squared distance between `p` and `q`.
Kernel::FT | operator() (const Kernel::Point_2 &p)
| returns the squared radius of the smallest circle passing through `p`, i.e. \( 0\).

## Member Function Documentation

Kernel::FT Kernel::ComputeSquaredRadius_2::operator() | ( | const Kernel::Point_2 & | p,
|  | const Kernel::Point_2 & | q,
|  | const Kernel::Point_2 & | r
| ) |  |

returns the squared radius of the circle passing through `p`, `q` and `r`.

Precondition
  `p, q` and `r` are not collinear.