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Sridhar Bojja 5Sridhar Bojja 5 

How to identify unused apex classes , triggers and visualforce pages

How to get the list of unused apex classes, triggers and visualforce pages
Gabriel C FerreiraGabriel C Ferreira
This is a bit old, but may work for you:
https://andyinthecloud.com/2013/02/02/spring-cleaning-apex-code-with-the-tooling-api/
 
Raj VakatiRaj Vakati
You can do one more thing 

Go and delete the apex class and pages to delete