Answer:
The circumference of Dan's circle is approximately 50.27 inches. 
Step-by-step explanation:
The length of the circumference ( ), measured in inches, is determined by the formula:
), measured in inches, is determined by the formula:
 (1)
 (1)
Where  is the radius, measured in inches.
 is the radius, measured in inches. 
If we know that  , then the length of the circumference is:
, then the length of the circumference is:


The circumference of Dan's circle is approximately 50.27 inches.