Answer: The circumference is 21.98
Explanation:
I’m assuming instead of radio, you meant radius!
The equation for circumference of a circle is:
C = 2πr (Circumference equals two times pi times the radius)
You already know that pi ≈ 3.14, and that your radius is 3.5, so now we substrate he numbers into the equation.
C = 2 (3.14) (3.5)
C = 6.28 (3.5)
C = 21.98
Therefore, the circumference is 21.98
Hope this helps! :)