Geometry crossword puzzle

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Across
  1. 1. angles on the outside of the two parallel lines but on the opposite side of the transversal
  2. 3. the division of something into two equal or congruent parts
  3. 5. less than 90°
  4. 6. when two of more angels add up to 180°
  5. 7. the middle point of a line segment
  6. 13. set of points on a line
  7. 14. angles that are formed when two parallel lines are intersected by the transversal
  8. 15. a triangle with all three sides of equal length
  9. 16. a transformation that occurs when a figure is moved from one location to another location
  10. 18. a transformation representing a flip of a figure
  11. 19. angle greater than 90°
  12. 20. two angles that are on the same side of the transversal and on the interior of the two lines
Down
  1. 2. angles on the inside of two parallel lines but on the opposite side of the transversal
  2. 4. two lines that never intersect
  3. 8. Two distinct lines intersecting each other at 90°
  4. 9. set of points on a shape
  5. 10. when two angels add up to 90°
  6. 11. angle of exactly 90°
  7. 12. the sum of the squares on the legs of a right triangle is equal to the square on the hypotenuse
  8. 17. a triangle in which two sides have the same length