Chapter 9 math Vocab

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Across
  1. 3. Two angles that have opposite angles formed by the intersection of two lines.
  2. 4. Two angles that share a common side and have the same vertex.
  3. 7. The distance around the boundary of a circle.
  4. 10. Is made up of triangles, squares, rectangles, semicircles, and other two-dimensional figures.
  5. 12. One half of a circle.
Down
  1. 1. Two angles that have a sum of 180 degrees.
  2. 2. The mathematical constant that is the ratio of a circle's circumference to its diameter.
  3. 5. Two angles that have a sum of 90 degrees.
  4. 6. The middle point in a circle.
  5. 8. The distance from the center to any point on the circle.
  6. 9. The distance across the circle through the center.
  7. 11. The set of all points in a plane that are the same distance away from the center.