Geometry

6. an arc of a circle who's endpoints are the endpoints of the diameter
8. of a circle two points on a circle and the continuous part of the circle between the two points
11. distance around a circle/perimeter of the circle
12. length a fractional distance of a circle defined by the arc
13. a chord that contains the center of a circle
14. a line that contains a chord
16. a segment from a point on a circle or sphere to the center

1. angle angle whose vertex is the center of the circle and whose sides contain radii of the circle
2. the set of all points in a plane at a given distance from a given point in the plane
3. angle angle whose vertex lies on a circle and whose sides contain chords of the circle
4. arc an arc of a circle whose length is greater than the length of a semicircle
5. a line that lies in the plane of a circle and intersects the circle at the point of tangency
7. circles circles the same radius
9. circles circles that lie in the same plane that share the same center
10. arc an arc of a circle whose length is less than the length of a semicircle
15. a segment whose endpoints lie on a circle