An angle that measures 90 degrees
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If you mean cosine then it is angle ratio found in a right angle triangle which is adjacent/hypotenuse
A right bisector of a line segment, is better know as a perpendicular bisector. It is a line that divides the original line in half and is perpendicular to it (makes a right angle).
It is: "angle a is not a right angle" or "angle a is greater than or less than a right angle".
A pentagon has five angles, and all of them are less than a right angle. So, the answer is five angles less than a right angle. Math doesn't have to be a Pentagon-level secret, honey.
A right angle measures 90 degrees