Answer:
Step-by-step explanation:
The formula of a circumference of a circle:
<em>d</em><em> - diameter</em>
<em>r</em><em> - radius</em>
We have the radius <em>r = 20</em>.
Substitute:
use π ≈ 3.14
C = 2πr = 2 * 3.14 * 20 = 125.6
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