The length squared of a segment in space: distance2

### 14.12.8 The length squared of a segment in space: distance2

See Section 13.14.3 for squares of lengths in two-dimensional geometry.

The distance2 command finds the square of the distance between two points.

- distance2 takes two arguments:
  P,Q, two points or two lists with the coordinates of the points.
- distance2(P,Q) returns the square of the distance between P and Q.

#### Example

Input:

distance2(point(-1,1,1),point(1,1,1))

or:

distance2([-1,1,1],[1,1,1])

Output:

4