Geometry

4. two coplanar angles with a common vertex and a common side between them
7. length of the circle
11. six sides
12. a line in the plane of the circle that intersects the circle at a 90 degree angle
14. two lines that intersect to form right angles. 33. Parallel lines – two lines are parallel if they are coplanar and do not intersect.
17. a point that divides the segment into two congruent segments.
19. are noncoplanar lines they will not intersect. Polygon union of 3 or more coplanar segments that meet only at endpoints such that at most two segments meet at one endpoint and each segment meets exactly two other segments.
20. triangle triangle with all sides congruent.

1. two angles whose sum is 90 degrees. 31. Supplementary angles – two angles whose sum is 180 degrees.
2. sum of the area of all its faces.
3. the non-adjacent angles formed by two intersecting lines.
5. a segment that connects two points on the circle.
6. a circle angle whose vertex is the center of the circle and whose rays are radii of the circle.
8. line, ray segment, or plane divides a segment into two congruent segments.
9. r2
10. half the central angle
13. π
15. half the diameter
16. a branch of mathematics that deals with points, lines, planes and solids and examines their properties.
18. a polygon which is equilateral and equiangular.