Angles and Shapes

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Across
  1. 5. angle that adds up to 180 degrees
  2. 8. prism- looks like a book
  3. 10. the line joining 2 vertices of a solid
  4. 12. 2 angles whose sum is 90 degrees
  5. 13. a solid shape with constant cross section
  6. 17. angles that are smaller than 90 degrees
  7. 18. angle - makes a half turn
  8. 19. a cube has 6 of these
Down
  1. 1. shape has no vertices it is round
  2. 2. we use this instrument with the degrees on it
  3. 3. angle that measures more than 90 degrees but less than 180 degrees
  4. 4. a flat shape folds to make a solid
  5. 6. a polygon with 3 sides
  6. 7. a point where 2 angles begin or meet
  7. 9. measures to 90 degrees
  8. 11. sum of angles 360 degrees
  9. 14. an angle that is greater than 180 degrees but less than 360 degrees
  10. 15. the plural of vertex
  11. 16. -this shape has 6 square faces
  12. 20. this shape has 2 circular faces and 1 curved face