A dependent variable.
It is called a "right angle".
commonly called a right angle
An angle which measure exactly 90 degrees is called a right angle.
it is called a straight angle, because the shape of the angle is a straight line.
Its going on for years but know one exactly knows.
An angle whose measure is exactly 180 degrees is a straight angle.
temperature
It is going to measure exactly the same alowing for wear and tear. unless there has to be a confersion from imperial to metric or vice versa.
A right angle is exactly 90 degrees
Refuse to report the measure - Apex
Absolutely. Devices called interferometers are used to measure small distances in exactly that way.
A "fathom" is exactly 6 feet.