Geometry Crossword

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Across
  1. 3. 2 pairs of parallel lines
  2. 4. flat surface on a 3D shape
  3. 6. the corners of a shape
  4. 12. Hint: everything but bases
  5. 13. hint: area with the bases included
  6. 16. the boundry around a closed figure
  7. 17. A = 1/2 x (B1 + B2) x h
  8. 18. synonym of 2D shape
  9. 20. a 2D shape with 3 Sides, angles, and vertices
Down
  1. 1. the distance around a circle
  2. 2. half of a diameter
  3. 5. this word is literally the name of the subject
  4. 7. twice the radius
  5. 8. hint: its not 2D
  6. 9. length x width
  7. 10. the 'bottom' of a shape (not really)
  8. 11. length x width x height
  9. 14. includes degrees
  10. 15. tool used to find surface area
  11. 16. there is a rectangular and triangular version of this 3D shape
  12. 19. think of the cool structure in Egypt