The answer depends on what fbe stands for.
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A right angle is a measure of 90 degrees or a 1/4 of a turn
It is pi/4 radians.
A right angle is a measure of 90 degrees or a 1/4 of a turn
It is: 40 degrees and 90 degrees respectively
The 4 interior angles of any 4 sided quadrilateral add up to 360 degrees