banging /banGING/(adjective)- excellent, first-rate; derivative from 17th-century British phrase "bang up to the mark".
As the title suggests, the contents of this workbook are banging (henceforth spelled as bangin'.)
The segments- bangin'!
The circles- bangin'!
The points- bangin'!
The angles- more like bangles!
The grade- maybe not as bangin' but hopefully reflective of the efforts put into this workbook.