Lines, angles, triangles

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Across
  1. 3. line that passes through the midpoint of a segment
  2. 4. angles on the same side of a transversal, both interior or both exterior
  3. 6. lines that never intersect
  4. 8. two angles in the same position at each intersection between lines and a transversal
  5. 10. straight line perpendicular to a segment that passes through the midpoint of the segment (two words)
  6. 13. angles opposite to each other when two lines intersect
  7. 14. lines that intersect and form a right angle
Down
  1. 1. angles that share a common vertex and a common arm
  2. 2. triangle with all different sides
  3. 5. triangle with three equal sides
  4. 6. lines with the same slope
  5. 7. angles on the opposite side of a transversal, but both inside the lines cutted by the transversal (interior) or both outside them (exterior)
  6. 9. line that intersect other two lines
  7. 11. triangle with two equal sides
  8. 12. lines that cross each other