360 degrees
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360 because ALL quadrilaterals have an angle sum of 360
The sum of all (interior) angles must equal 360 degrees
All polygons with four angles (quadrilaterals) have a inner angle sum of 360 degrees.
360, since all quadrilaterals' interior angles add up to 360.
A trapezium is a quadrilateral and, as with all quadrilaterals, its interior angles sum to 360 degrees.