HERON'S FORMULA

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Across
  1. 2. A triangle with three different sides.
  2. 5. Birthplace of Heron
  3. 6. Sum of all sides upon two.
  4. 8. Triangle with two equal sides.
  5. 9. Comparison of two or more quantities.
Down
  1. 1. Great mathematician of 10 A.D
  2. 2. Measure of an angle in an equilateral triangle.
  3. 3. A triangle with all sides.
  4. 4. Number of books written by Heron.
  5. 7. Another name of trapezoids.