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The 4 interior angles of a trapezium add up to 360 degrees
It is: 180 degrees
A trapezium has 4 interior angles that add up to 360 degrees
Consider the trapezium (or trapezoid) ABCD such that AD is parallel to BC.Then angles DAB and ABC are consecutive interior angles (or co-interior angles) and sum to 180 deg.Similarly, angles ADC and DCB sum to 180 deg.Therefore, the sum of all four is 180 + 180 = 360 deg.
The sum of the exterior angles of ANY polygon is 360 degrees.