Michael O Ossipov asked in USMA 26317:.
Concerning the circle, why not use the radian? Isn't the radian one
of the SI base units? (If not, I'm sure I'll stand corrected).
The right angle, i.e. 90�, would become 1.570 796 327.......rad. Try
selling that to machinists. They also prefer to split the right angle
into 30� and 60� rather than 33.333 333 ... grad and 66.666 666...
grad. Hence the degree of angle is recognized as "accepted for use
with the International System", but ISO 31 recomends that the degree
be subdivided decimally rather than using the minute and second. The
grad or gon of 100 gon to the right angle is not recognized by the
CGPM, although it is used by some Europeqan surveyors.
--
Joseph B. Reid
17 Glebe Road West
Toronto M5P 1C8 Telephone 416-486-6071
