The formula to find circumference of a circle is: pi X diameter.
In this case, pi is 3.14 and the diameter is 10.
To find the circumference of this circle, use the formula, sub in pi as 3.14 and diameter as 10.
Circumference of this circle = 3.14 X 10= 31.4 units
Feel free to clarify if you have any questions!
