6. What is meant by an angle in a segment?
7. If an arc of a circle be one-sixth of the whole circumference, what is the magnitude of the angle in it?
8. What are linear segments?
9. What is meant by an angle standing on a segment?
10. What are concyclic points?
11. What is a cyclic quadrilateral?
12. How many intersections can a line and a circle have?
13. What does the line become when the points of intersection become consecutive?
14. How many points of intersection can two circles have?
15. What is the reason that if two circles touch they cannot have any other common point?