Question

How was I supposed to solve these questions?
1.) http://i.imgur.com/6f8TJMq.png
2.) http://i.imgur.com/nIubj82.png
3.) http://i.imgur.com/I12i5KU.png
4.) http://i.imgur.com/PC2G3n0.png

Answer 1

the angle at the cimcumferece is half the angle at the center

Answer 2

if you'd like i can show u proof for why this angle at the circumference is always half the angle at the center, or give you links that show u it

Answer 3

Thanks! Could you show me what I'm supposed to do for 3 and 4?