1 answer
(click or scroll down)
corresponding angles are congruent for similar polygons.
If the polygon has n sides, the angles sum to 180(n-2)
If that doesn't get you to a solution, then how about you
(a) Label the vertices of each polygon ABCD... PQRS...
(b) label the sides opposite the vertices a,b,c,d... and p,q,r,s...
Then just tell the values of the various angles and sides that are labeled,