No it must have 3 or more interior angles
Only if the polygon is a "regular" one.
Only if it is a regular polygon.
Only if the polygon is "regular".
An acute polygon is one whose interior angles are all acute. Only a triangle can be an acute polygon.
Only when it is a regular polygon that all interior angles are of equal measure
The only regular polygon with an interior angle of 90 degrees is the square, which has four sides. Other polygons can have an interior angle of 90 degrees, but they would not be regular polygons.
If the polygon is regular, the measure of one interior angle of a 24 side polygon is 165 degrees.
I believe to what you are referring is a concave polygon. This is when one of the sides "falls into" the interior of the polygon, which can be tested by a line test. The other kind of polygon, where all sides are exterior, are called convex.
A concave polygon.
Anything you like. Any single interior angle of a polygon is indeterminate - the only constraint is on the sum of all the interior angles.
The angles between adjacent sides of a polygon that are interior to the polygon. If the polygon is convex, the interior angles are always less than 180 degrees. If it is concave, at least one interior angle will be greater than 180 degrees.
Any polygon can have an interior angle of 144 degrees. The measurement of an interior angle of a decagon is 144 degrees.