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How do you draw a one-quarter right- angle turn
There are 90o in a right angle. A right angle is one-quarter of a full circle i.e. 360o.
A right angle is one quarter of a revolution and it measures 90 degrees.
The definition of a right angle is one quarter of a circle. If you're using the popular system of 360 degrees in a circle, then a right angle is 90 degrees.
All right angles measure 90 degrees, that is, one-quarter of a full circle. If the angle doesn't measure 90 degrees it isn't a right angle; all right angles are identical.