Geometry Crossword

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Across
  1. 2. when two angles share the same side and corner
  2. 4. when you mirror something and its shape is the same.
  3. 6. opposite of convex
  4. 10. square on a lean
  5. 11. three-sided shape with equal side lengths
  6. 13. five-sided shaped building in Virginia USA
  7. 14. angles that add up to 180 degrees
  8. 15. the middle of a cross
  9. 17. the angle of which is to the left of a right angle, and above the straight line
  10. 18. opposite of vertical
Down
  1. 1. square-based triangle
  2. 3. angles that add up to 90 degrees
  3. 5. opposite of concave
  4. 7. a 2D shape that has only straight lines and is closed
  5. 8. Noah's ___
  6. 9. when two of the same shape are of the same size but are in different positions
  7. 12. a flat shape with straight lines
  8. 13. lines that intersect at a 90-degree angle
  9. 16. six-sided shape