The measure of the opposite angles of an inscribed quadrilateral are supplementary.
Since we don't know the value of x we will set angle B + angle D = 180.
28 + x = 180
x = 180 - 28
x = 152
Now substitute 152 for x and find the measure of angle A.
Angle A:
(x - 36)
(152 - 36)
116
Angle A is 116°
Hope this helps :)
