Geometry

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Across
  1. 4. from the edge to the center of a circle
  2. 5. straight 1D figure
  3. 7. 2D closed shape
  4. 9. line segment connecting two points on a curve
  5. 10. three-sided polygon
  6. 13. line that touches a curve at one point
  7. 14. point where 2 or more-line segments meet
  8. 15. portion of a circle's circumference
Down
  1. 1. polygon with four sides, vertices, and angles
  2. 2. straight line segment through the center of a circle
  3. 3. fragment
  4. 6. represented by a dot
  5. 8. space inside a shape
  6. 9. from the center to the edge is the radius
  7. 11. part of a line starting at endpoint
  8. 12. 2 straight lines that meet at a common endpoint