i’m stuck with these questions

Answer:
Step-by-step explanation:
3) using the property of opposite angles we can work out that HFJ=138
Its that simple. if two lines intersect, the angles on either side are the same
4)I don't know how to find segments of circles...
Step-by-step explanation:
plz mark my answer as brainlist plzzzz.
hope this will be helpful to you