Answer:
1760 mm
Explanation:
The circumference of a circle can be found using:
c=2πr
We know that the radius is 280. Therefore, we can substitute 280 in for r
c=2π280
We also know that we are using 22/7 for π, so we can substitute that in
c=2* 22/7 * 280
Multiply
c=560* 22/7
c=1760
So, the circumference is 1760 mm