They are acute, right, obtuse and reflex angles
Yes, they do exist. And the question is ... ?
It all depends what type of shape your talking about.
opposite angles in which type of quadrilateral?
It has two right angles
Equal angles.
If you mean interior angles of 2800 degrees then no such polygon exist because one of its sides woud not meet up with another side.
None. The angles do not exist and so there are no problems caused.
The object you describe doesn't exist.
Yes, they do exist. And the question is ... ?
It all depends what type of shape your talking about.
opposite angles in which type of quadrilateral?
It has two right angles
Equal angles.
5 angles, of course
90 degrees angles or right angles.
It has 4 90 degree angles.
none exist.