6th grade math, I don't need help with all of them, problems attached

1. C
2. A
3. C
4. C
5. B
6. A
7. A
8. A
9. I’m at school right now so can’t work that out but i hope the answers i gave you help!

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .