I made a "D" on my final in Geometry, so triangles aren't my thing, anyway. I'm sorry your teacher isn't able to make Trig exciting. I found when I took a lot of notes in a class I had to stay awake. Also, maybe you can find someone who is doing well and get some pointers.

When I took Statistics in grad school I got another book that sometimes explained things in a way that helped me to understand more.

Is there an official tutoring program at your school? Have you talked to your teacher about wanting extra help?