Answer: the top left and top right are similar
Explanation:
Similar means the sides are proportional meaning you multiplied the small one by the same number to get a shape that is "similar" (same angles, same shape just bigger or smaller.
So the first one, you multiply both sides by 2 (3x2) and (5x2) = 6x10 so yes similar
the second one isn't same shape so it is not similar
the third one doesn't have the same angles so it's not the same shape
the fourth one is not multiplied by same number to be increased
the fifth one is similar because it's the same shape but 3 times bigger
the bottom shape is the same exact shape but just flipped so it is congruent not similar