if angle R = 60 and angle S = 80 then angle T = 180 - 80 - 60 = 40
D ~ T
F ~ R
if 2 angles are congruent the 3rd must be
E ~ S
if RS = EF then those would be correct corresponding sides to go with those corresponding angles
and it is congruent by AAS.
Resource: google and yahoo (rightful owners)
