Geometry Crossword

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Across
  1. 2. a line segment joining a vertex to the midpoint of the opposite side
  2. 4. angles greater than 90 degrees
  3. 7. angles that are equal to 180 degrees
  4. 8. add up all the sides
  5. 10. the geometric center of a two-dimensional plane figure
  6. 12. a line segment with a single endpoint
  7. 13. space an object takes up (2D)
  8. 14. an exact position
  9. 15. pairs of angles that are opposite each other when two lines intersect
  10. 16. the point where the three altitudes of a triangle intersect
  11. 18. a triangle where two sides are congruent
  12. 19. an infinitely long set of points
  13. 20. triangle with all sides being equal
Down
  1. 1. 6 sided shape
  2. 3. a^2 + b^2 = c^2
  3. 5. triangle where all side lengths are different
  4. 6. line that cuts an angle in half
  5. 9. 8 sided shape
  6. 11. lines that cross at a "T" and create a 90 degree angle
  7. 17. angles less than 90 degrees