This is because all the angles are 90 degrees. This is usually because there are 4 angles and them up to 360degrees.
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All polygons with four angles (quadrilaterals) have a inner angle sum of 360 degrees.
The sum is equal to 360 degrees.
A trapezium is a quadrilateral and, as with all quadrilaterals, its interior angles sum to 360 degrees.
Quadrilaterals.
Yes the 4 interior angles of all quadrilaterals add up to 360 degrees