You can embed a folder from your Drive the same way you would embed the lesson plan folder. The class resources folder would include things like class rules, handouts, presentations, and can include sub-folders with other resources.
The NCTM Illuminations website offers a variety of fun and engaging activities to help your child learn Geometry!
IXL Geometry: Plenty of practice for just about every Geometry topic! This website is great for helping students get ready for a test.
NVLM: Below is a link to the National Library of Virtual Manipulatives, a great way to help Geometry students who are more visual learners!