### 11.6.2 The point in the plane: point

See section 12.4.1 for points in space.

In the 2-d geometry screen in point mode, clicking on a point with the
left mouse button will choose that point. Points chosen this are
automatically named, first with A, then B, etc.

Alternatively, the point command chooses a point, where the
point (a,b) is specified by either the two coordinates a,b, a
list [a,b] of the coordinates, or the affix a + b*i.

Input:

A := point(2,1)

or:

A := point([2,1])

or

Input:

A := point(2 + i)

Output:

(The marker used to indicate the point can be changed; see section
11.3.2.)

If the point command has two numbers for arguments, at least
one of which is complex but not real, then it will choose two points.
Entering

Input:

A := point(1,2*i)

or:

A := point([1,2*i])

will choose two points named A; one with affix 1 and
one with affix 2i.