The angles of a quadrilateral add to 360 degrees.
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A quadrilateral is a shape with four sides... It doesn't have *one* angle. The sum of the interior angles of a quadrilateral will always be 360 degrees, however, it is impossible to know the value an individual angle of a quadrilateral with the information given.
The sum of the 4 interior angles of any quadrilateral add up to 360 degrees.
A regular quadrilateral has 4 angle and their sum must be 360 degrees by the general formula 180 degrees (n-2) for the number of angle in an n sided polygon. So there are 180(4-2)=360 degrees. Since it is regular this means each angle is 360/4=90 degrees.