a 4 angled shape will add up to 360
However we know to know the shape of the object if we are to get two unknowns
We know that angle1 + angle2 + angle3 + angle4 = 360
and we know that 26 + angle2 + 53 + angle4 = 360
and thus we know that angle2 + angle4 = 81
But without more information, I can't help you further
