Herons formula

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Across
  1. 2. triangle
  2. 4. area
  3. 7. base
  4. 8. right
  5. 9. The man who created the formula
  6. 10. height
  7. 12. isosceles
Down
  1. 1. semi perimeter
  2. 3. quads
  3. 5. length
  4. 6. perimeter
  5. 11. hypotenuse
  6. 13. equilateral