chapter 9 math vocab

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Across
  1. 3. Opposite angles formed by the intersection of two lines
  2. 4. two angles that share common sides and have a vertex
  3. 7. the distance around a circle
  4. 10. a figure made up of triangles, squares, rectangles, and other two-dimensional figures
  5. 12. One-half of a circle
Down
  1. 1. two angles whose measures have a sum of 180 degrees
  2. 2. the ratio of the circumference of a circle to its diameter
  3. 5. two angles whose measures have a sum of 90 degrees
  4. 6. the point inside a circle that is the same distance from all points on the circle
  5. 8. the distance from the center of a circle to any point on the circle
  6. 9. the distance across the circle through the center
  7. 11. the set of points in a plane that are the same distance from a point called the center