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? 1.the number of sides of the polygon 2.the angle measures of the polygon. 3.the line of reflection. 4.none of these. they will always be congruent.

The angle measure of the polygon, because angle measure is preserved in a reflection because its a rigid transformation. And option #4 is wrong because option #2 is right

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm