What is the fourth angle of 82, 78, 90 degrees

the fourth angle is 110

If 82, 78, and 90 are 3 of the four angles of a quadrilateral, and if the question is to find the measure of the fourth angle of the quadrilateral, then do this:

The sum of the interior angles of a quadrilateral is 360.

Let x represent the fourth angle.

82 + 78 + 90 + x = 360

250 + x = 360

x = 110

The measure of the fourth angle is 110