Adine's Puzzle

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Across
  1. 7. Quadrilateral+parallel sides
  2. 8. Connection between midpoints and sides
  3. 9. Sides and inside angles are equal
  4. 11. Triangle with two equal sides
  5. 15. Isosceles+congruent triangles
  6. 17. A shape with many vertical sides that connect
  7. 18. Four sides, one pair parallel
Down
  1. 1. Four!!!!
  2. 2. Two lines that intersect at right angles
  3. 3. Quadrilateral+four!
  4. 4. Divided into two equal parts
  5. 5. Four same length sides, opposite sides are parallel
  6. 6. Fully equal to each other
  7. 10. Quadrilateral, equal and parallel
  8. 12. 180...
  9. 13. Equal triangle
  10. 14. Equal angles
  11. 16. Non adjacent