Answer:
[tex]\huge\boxed{C\approx125.6}[/tex]
Step-by-step explanation:
The formula of a circumference of a circle:
[tex]C=d\pi=2\pi r[/tex]
d - diameter
r - radius
We have the radius r = 20.
Substitute:
[tex]C=2\pi(20)=40\pi[/tex]
use π ≈ 3.14
[tex]C\approx(40)(3.14)=125.6[/tex]
