I'm brushing up on my calculus, and geometry and trigonometry keep coming up. However, these are probably my weakest areas mathematically. Are there any good sites or free PDFs/ebooks that I can use to quickly (in a weekend, preferably) work through geometry and trigonometry and refresh myself in topics such as areas and volumes of various geometric shapes, trigonometric functions, relationships between angles of a given shape or structure?
It's been over 8 years since I took a geometric or trigonometric course (it was back in high school) and over 2 years since I took any course that even relied on geometry or trigonometry. I'm not looking for anything incredibly complex, either. Just something to cover the topics that I'm encountering in integral and differential calculus.