1. A is a line joining the centre of a circle to the circumference.
2. Several points all onthe same line are said to be [?]
3. Opposite angles in a cyclic quadrilateral add to [?] degrees.
4. A [?] is a line joining two points on a circle.
5. A quadrilateral which has all four vertices on a circle is said to be [?]
6. In a cyclic quadrilateral an interior angle is equal to the [?].
7. Angles on the same arc of a circle are .
8. A [?] is part of a circle bounded by two radii and an arc.
9. Points all on the circumference of the same circle are said to be [?].
10. The angle in a semi-circle is [?] degrees.
11. A [?] is perpendicular to the radius at the point of contact.
12. The angle at the centre of the circle is [?] the angle at the circumference.
13. A [?] is a chord which passes through the centre of a circle.
14. An [?] is part of the circumference of a circle.
15. Lines all of which pass through the same point are said to be [?].
16. A [?] is part of a circle bounded by a chord and an arc.