Geometry!

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Across
  1. 4. set of points that has infinite length, but no width or height
  2. 5. two rays that share the same endpoint
  3. 7. equals 180 degrees
  4. 9. a set of points that has infinite length and width but no depth
  5. 10. location in space
  6. 11. two lines that never intersect
  7. 13. slide down the angles
  8. 14. the distance around a circle
  9. 16. the points at the end of a line segment
  10. 17. the common point shared by both rays
  11. 18. the set of all points equidistant from a fixed point called the center
  12. 19. points that lie on the same line
Down
  1. 1. set of all points
  2. 2. two lines that intersect forming 90-degree angles
  3. 3. share same angle
  4. 6. the part of a line that contains an endpoint and all points extending in the other direction
  5. 8. the study of points, lines, planes, and solids and examine their properties
  6. 12. cut into equal parts
  7. 15. same shape, size, and value