Everyone makes mistakes. Today, I posted a private comment about a student’s work twice by accident, and was annoyed I couldn’t find out how to delete either one of the comments. I googled it, and hidden deep in the thread, found this method that works! Thanks Gareth Davies and Angus Chan.
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This is a good sources of notes for teaching geometry, or for students with 504s/IEPs. The notes probably require explanation, but are a good starting point. These notes even go into the derivation of the formula for the area of a circle.
https://www.science.edu/Acellus/teacher/notes/Geometry/GEONotes.pdf