Geometry Crossword puzzle

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Across
  1. 3. — When a figure can be folded into matching halves.
  2. 6. — A four‑sided polygon.
  3. 7. — The measure of surface inside a shape.
  4. 9. — A segment connecting two points on a circle.
  5. 10. — Lines that intersect at a right angle.
  6. 11. — A figure formed by two rays with a common endpoint.
  7. 12. — A part of a line with two endpoints.
  8. 13. — A line with one endpoint extending infinitely in one direction.
  9. 15. — Distance from the center of a circle to any point on it.
  10. 17. — A flat, two‑dimensional surface extending infinitely.
  11. 18. — An angle greater than 90°.
  12. 19. — A 90° angle.
Down
  1. 1. — The point where two lines or edges meet.
  2. 2. — The distance around a circle.
  3. 4. — A three‑sided polygon.
  4. 5. — Lines that never intersect.
  5. 8. — A closed figure with straight sides.
  6. 10. — The distance around a shape.
  7. 14. — An angle less than 90°.
  8. 16. — A line passing through the center of a circle connecting two points on the circle.