Their sum does.
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The sum of all inside angles of a quadrilateral equal 360 degrees.
The 4 interior angles add up to 360 degrees
The interior angles of all quadrilaterals sum to 360 degrees. Since a parallelogram is a quadrilateral, its interior angles must sum to 360 degrees.
Yes the 4 interior angles of all quadrilaterals add up to 360 degrees
A trapezium is a quadrilateral and, as with all quadrilaterals, its interior angles sum to 360 degrees.