After maniac taught grayson to read the narrator described grayson using this figurative language: his smile was so wide he'd have had to break it into sections to fit it through the doorway. what type of figurative language is used and what does the sentence about grayson mean?

Hyperbole

The sentence means that Grayson extremely happy to have learnt how to read.

Explanation:

Hyperbole refers to an exaggerated statement which is not meant to be taken  literally. As a result, the sentence about Grayson is a metaphor, amplification or enlargement. The writer does not expect the reader to take the sentence truly; actually, he or she means that Grayson feels in such high spirits about learning how to read that he has a huge smile on his face.

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