Geometry theorem help! please.?

Question

I'm taking practice exams and I'm really confused. can someone help me please and thank you in advance.

link

http://i127.photobucket.com/albums/p153/nanipics1/emamgeo005.jpg

Answer 1

The first two I learned as "F theorem" and "C theorem" respectively (regarding the general shape made by the lines). The full names are provided in the "Theorems" section in my first source.

As for the next set of questions, the way to calculate it is to know that the angles on opposite sides add to 180 degrees.

11. 140deg

12. 40deg

13. 40deg

14. 140deg

15. 40deg

16 Refer to the theorems page provided.