Across
- 3. the set of all points in a plane that are the same
- 7. the distance across the circle through the center.
- 8. angles the sum of their measure is 180
- 10. the distance around a circle.
- 12. figure made up of triangles, squares, rectangles, semicircles, and other two-dimensional figures.
Down
- 1. angles are opposite angles formed by the intersection of two lines.
- 2. angles share a common side and have the same vertex.
- 4. in the middle of the circle
- 5. angles they share a common side and have the same vertex.
- 6. one-half of a circle.
- 9. 3.1495...
- 11. the distance from the center to any point on the circle.