Chapter 9 math

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Across
  1. 4. the distance around a circle
  2. 7. triangles, squares, rectangles, and semicircles.
  3. 10. a set of all points in a plane that are the same distance
  4. 11. the distance around a shape
  5. 12. the middle of something
  6. 13. angles two angles that share a common side
Down
  1. 1. half of the diameter
  2. 2. half of a circle
  3. 3. angles when they are opposite angles formed by the intersection of 2 lines
  4. 5. the distance across a circle
  5. 6. angles when the sun of their measures is 90
  6. 8. angles when the sun of their measures is 180
  7. 9. the inside of a 2 dimensional shape