Answer:
angrier; angriest
Step-by-step explanation:
Since the adjective angry is short and have two syllables, its comparative and superlative forms are as follows:
Comparative form:
Angry - we add er : angrier (the y becomes i), and use than to compare. Example: She is angrier than her sister.
The superlative form:
Angry - we add est : angriest (the y becomes i), and put the before it. Example: Fred was the angriest in the group.