Herons formula

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