Math crossword puzzle

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Across
  1. 2. the highest top
  2. 3. a figure whose 2 end faces are similar
  3. 4. a 90 degree angle
  4. 6. outer edge
  5. 9. a triangle where all sides are different lengths
  6. 11. a triangle that has 2 sides with equal length
  7. 14. the highest point
Down
  1. 1. a line that makes a right angle with the other one
  2. 5. a zone or region
  3. 7. if all the sides on it are equal
  4. 8. remaining after the deduction of charges
  5. 10. the place of something
  6. 12. a figure with 3 straight sides/angles
  7. 13. the outside layer of something