What do the angles of a quadulatural add up to?

The angles of a quadrilateral always add up to 360 degrees. This holds true for all types of quadrilaterals, including squares, rectangles, and trapezoids. You can visualize this by dividing the quadrilateral into two triangles, as the angles of each triangle sum to 180 degrees, leading to a total of 360 degrees for the quadrilateral.