Ramanujan

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Across
  1. 2. What does M signify in BODMAS
  2. 4. Made a formula which gave the area of a triangle
  3. 6. How many tangents can be made in a circle?
  4. 8. What is the perimeter of a circle
  5. 10. Indian mathematician who invented zero
  6. 11. What are these called () {} []
Down
  1. 1. A number which when read right to left or left to right will be the same
  2. 3. In h^2=p^2+b^2, what does p signify
  3. 5. Longest Chord
  4. 7. The only even prime number
  5. 9. The reciprocal of sine