Geometry

6. Two angles that are opposite angles formed by an intersection and have the same measure.
9. The distance around a circle.
10. The distance across the circle through the center.
11. Two angles that add up to measure 180 degrees.
12. the height of the lateral side of a pyramid
13. One-half of a circle.
15. a pyramid whose base is a regular polygon and whose lateral faces are congruent isosceles triangles
16. The sum of the areas of all of the lateral faces of a solid.

1. A figure made up of two-dimensional figures.
2. Two angles that share a common side and have the same vertex.
3. The set of all points in a plane that are the same distance from a point.
4. The ratio of the circumference to the diameter. This is the same in every circle and is represented by a greek letter
5. The middle of a circle.
7. The distance from the center to any point on the circle.
8. the intersection of a three-dimensional figure and a plane
14. Two angles that add up to measure 90 degrees.