Math-a-search

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Across
  1. 1. 12 flat faced Polyhedron
  2. 4. Greek letter to denote angles
  3. 5. Father of Geometry
  4. 7. Shape of a sheet of paper
  5. 8. sin/cosine
  6. 10. Branch of mathematics dealing with variables
  7. 11. Father of Indian Mathematics
Down
  1. 2. Father of Mathematics
  2. 3. Branch of mathematics dealing with integrals and functions
  3. 6. What does 'd' mean in 3d?
  4. 9. Repeated Exponentiation