please answer the four answers below :) if you cant see click on the picture(s) and zoom in



Answer:
For question 5 the correct formula is C=πd
For question 6 the correct formula is C=2πr
For question 7 the answer is 56.52 I think I'm not 100% sure though
For question 8 the answer is 31.4
Step-by-step explanation: