Answer :
Answer: Circumference is 132 inches.
Step by step explanation:
The circumference of a circle can be calculated with the formula:
[tex]\begin{gathered} C=2\pi r \\ C=\text{circumference} \\ r=\text{radius} \end{gathered}[/tex]The diameter is twice the radius, diameter = 2*r
[tex]\begin{gathered} r=\frac{diameter}{2} \\ r=\frac{42}{2}=21in \end{gathered}[/tex]Then the circumference is:
[tex]\begin{gathered} C=2\times\pi\times21 \\ C=131.95in \end{gathered}[/tex]