It’s 12.6, the top and bottom sides are parallel to each other.
ANSWER
The greatest common factor is

EXPLANATION
We want to find the greatest common factor of

and

The prime factorizations are;

and

The product of the least powers of the common factors is the greatest common factor.
Answer:
its 68mm
Step-by-step explanation:
The circumference of a circle can be found using the equation 2 π r
(2)(3.14)(4.5) = 28.26 (or 28 13/50 if you need it in fractions)