Geometry Crossword Puzzle

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Across
  1. 3. The length from the center of a circle to the edge of a circle
  2. 4. Something that is formed with two rays or line segments that share a common endpoint
  3. 5. A one dimensional figure that goes on forever in two directions
  4. 8. The surface that a 3D object rests on
  5. 11. Two angles that add up to be a right angle
  6. 14. Two angles that add up to be 180º
  7. 16. The length from the base to the highest peak in a pyramid
  8. 17. The amount of square units a shape takes up
  9. 18. The perimeter of a circle
  10. 20. A polygon with one set of parallel lines
Down
  1. 1. A polygon with interior angles that all add up to 180º
  2. 2. Twice the radius
  3. 6. The amount of space or cubic units a 3D figure takes up
  4. 7. The flat surface of a 3D shape
  5. 9. A shape with two sets of parallel lines and four right angles
  6. 10. The name of an angle less the 90º
  7. 12. A 3D figure that only has ONE base
  8. 13. A 3D figure opened and laid out flat
  9. 15. A pair of lines that never intersect
  10. 19. A 3D figure that does not come to a one single point