Apolygon is reflected across a line. the angles in the original figure are compared to the corresponding angles in the image to see if they are congruent. which factors does this depend upon?

When a polygon is reflected about a line, the reflected figure will be exactly the mirror image of the original figure.

So, we can say that the shape and size of the new polygon will be exactly the same as the original polygon.

So, the corresponding angles  and corresponding sides, all will be same or identical.

Hence, the polygons will always be congruent.