Geometry Crossword

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Across
  1. 2. same shape and size
  2. 5. an exact half of a sphere
  3. 6. three or more points lie on a single straight line
  4. 7. having a common vertex and a common side
  5. 10. line segment that divides angle into two equal parts
  6. 16. combination of two or more simple events
  7. 17. mirror image
  8. 18. connects the midpoint of two sides of a triangle
  9. 19. a triangle with three acute angles
  10. 20. midpoint
Down
  1. 1. two or more objects share center or axis
  2. 3. half circle
  3. 4. a number that cannot be expressed as a fraction for any integer
  4. 8. either of the angles of a triangle that have one side in common with the base
  5. 9. statement taken to be true without proof
  6. 11. the line segment joining two points on a curve
  7. 12. a line segment joining two vertices of a polygon when those vertices are not on the same edge
  8. 13. two equal sides
  9. 14. all sides excluding base and top
  10. 15. no internal angle greater than 180