Okay so as you know 2piR is the formula for circumference.
But in the question it was that u should 3.14 instead of pi.
So for the first question you would do 30 divided by 2 because 30 is the diameter. Then the radius is 15.
Then 15x2x3.14 will give you the circumference which is 94.2cm
Then for question 2 we do 25 x 2 x 3.14 which will give us 157m (always remember units)
For question 3 we would use 22/7 instead of 3.14
So what you would do is 42x22/7x2 which will give you 264cm
Then question 4 is more tricker because you would have to do 180 divided by 360 to give you 2. Then we divide 10 which is 5. Then 5 x 22/7 x 2 which is as a fraction 31 3/7m
Then thats all :)
