On Tue, 28 Nov 2017 09:17:37 +0200
ΔΗΜΗΤΡΗΣ Σ <dmtr...@gmail.com> wrote:

> The problem with 1) is that supplemantary angles have addition of 180
> degrees and the complemetary of 90 degrees. What is right?

The geometry in question is symmetric, where all the relevant angles
can be thought of as either formed by, or bisected by, the axis of
symmetry, so it doesn't make a whole lot of difference.  However, since
the "angle of view" property goes up to 180 deg., "supplementary" would
be more appropriate in this context.

> and something else:
> for the "bogus" what is more precise virtual, overlapping, or what?

A more formal alternative to "bogus" would be "invalid", "erroneous",
or "dubious".

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