Question

Check please :)

Answer 1

Your method of calculation is correct. However, the two decimal places are wrong. You need to use a more accurate value of \(\pi\) to get them right.
Use \(\pi=3.14159\).
(in fact, the question should have provided that. If the question did, use what the question provides).

Answer 2

I used 3.14 because that is what the lesson told me to do

Answer 3

Yes, in that case the answer is perfect!