Rounded to 2 decimal places 0.3081 is 0.31
The correct answer is 32.36
It is: 73.59
The correct answer is 5.98
The correct answer is 0.63
Rounded to 2 decimal places 0.3081 is 0.31
The correct answer is 32.36
The correct answer is 0.80
The correct answer is 54.27
The correct answer is 12.57
The correct answer is 5.47
It is: 73.59
The correct answer is 5.98
The correct answer is 0.63
The correct answer is 0.47
The correct answer is 0.59
The circumference is defined by 2* PI * radius Your calculation is therefore correct, but is depends upon what number of decimal places you need to quote your answer. The proper answer to two decimal places is 81.68.