maths challenge day

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Across
  1. 2. product of prime numbers in 80's
  2. 3. max number days in 6 years
  3. 4. square root of 13 squared - 5 squared
  4. 6. area of this shape - trapezium x (28)
  5. 7. palindromic square number
  6. 9. odd number that is 4th power
  7. 11. mean of .............
  8. 13. number seconds in 3 hours
  9. 14. 4x2160.5
  10. 16. product of first 7 numbers in Fibonacci sequence
Down
  1. 1. 4x+3 where x is (10)
  2. 2. (10800)x7
  3. 5. sum of the first 5 prime numbers
  4. 6. number multiplied by 4 is this reversed
  5. 7. sum of internal angles in a dodecagon
  6. 8. 83% of (121)
  7. 10. number of degrees in rhombus x (43)
  8. 12. (2178) divided by 3
  9. 15. square and cube number
  10. 17. number of digits in .....