Congruent figures are identical in size and shape.
Similar figures have the same shape and proportions but are not necessarily the same size.
All congruent figures are similar, but not all similar figures are congruent.
For the given pairs of figures:
Congruent: yes
Similar: yes
_____________
Congruent: No
Similar: No (The proportions are not the same)
______________
Congruent: yes
Similar: yes
________
Congruent: No
Similar: Yes