the 100000th decimal place of Pi is a 6. The following digit is a 4 and thus whether you round to the nearest 100000 decimal places or just print off the 100000th decimal place your answer will be 6. This can easily be found using Maple's evalf command.
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3.14159265358979323846264338327950288419716939937510582097494459230781640628
Surely you are not expecting someone to write out a million and one numbers.
The 91st decimal is 3.
For a GCSE test or something like that 3.14 would be fine.
For circumference, multiply the diameter by pi and round the product to the second decimal place. For area, multiply the square of the radius by pi and round the product to the second decimal place.