"pete" <email@example.com> wrote in message news:515C5712.firstname.lastname@example.org... > Tom Potter wrote: >> >> How would one measure a right angle >> without using geometry, >> or the 3-4-5 relationship, >> >> and how precisely can a right angle be measured? > > I place a straight edge > approximately perpendicular to a straight line, > and then I maneuver the edge to make adjacent angles > of equal size. > > It's very easy to accurately compare adjacent angles. > > I can't state the precission. > > -- > pete
Okay, let's assume that a laser beam is a "straight line" over the range of interest,
and let us "place a straight <laser beam> approximately perpendicular to <the> straight line,"
and juggle the "approximately perpendicular straight line" until the "adjacent angles" are equal,