well accoring to my calculations the angle sum of a quadrilateral is equal to the sum of 360 degress the way u do this is u find the exterior angles of one side of a quuadrilateral and do it for all the other sides if you have any other questions please post it to a new site call www.freewebs.com/1pkc thankyou we are more than welcome to help u
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Rectangles;all angles equal 90 degrees
No but as a 4 sided quadrilateral its 4 interior angles add up to 360 degrees
A parallelogram is a geometric quadrilateral with two pairs of parallel sides. The opposite sides and opposite angles are equal in length.
Yes because a parallelogram is a quadrilateral and the sum of its interor angles is 360 degrees.
The exterior angles of polygons equal 360 degrees.