Maths puzzle

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Across
  1. 3. a term used to describe two objects of same shape and size
  2. 4. the line drawn through the centre of one side of a triangle, parallel to its base and bisecting the third side refers to the _____ theorem
  3. 6. the formula ✓s(s-a)(s-b)(s-c) is popularly called ____'s formula
  4. 7. Archimedes was the first to compute and show that 3.140845 < __ < 3.142857
Down
  1. 1. the mathematicians, ______ and Fermat worked for the beginning of the Probability theorem.
  2. 2. if a circle passes through three vertices A,B and C of a triangle, its radius is called __________
  3. 3. a palne constituting of two perpendicular lines
  4. 5. the greatest value of exponents in a polynomial