well for any quadrilateral you would need 3 other angles, then you would add them up, and then subtract from the total you get out of 360(the number that all quadrilateral angles add up to).
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The missing word is "bisect".
the missing angle is 93 degrees. you find that out by adding 53 and 34 and then subtracting them from 180. :)
A rectangle.
90 degrees
A quadrilateral is not necessarily a rectangle. The only time this is not true is in the case of a square on a quadrilateral without four 90 degree angles.