It is: "angle a is not a right angle"
or
"angle a is greater than or less than a right angle".
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A right angle measures 90 degrees
right-angle triangle has at least one right angle .
There are 90o in a right angle. A right angle is one-quarter of a full circle i.e. 360o.
an angle with a acute and right angle
The negation of always is sometimes or never.