First, we all know the formula its 2R however here we see the diameter to find R we have to divide: 12.1 divided by 2=6.05 but for me thats really useless because in the end you still have to multiply it by 2 so to find the circumference just find the diameter and add a pie beside it so the answer would be 12.1 for the others do the same thing. (pls give me brainliest or something)
