Detailed Instructions: In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Q: Problem: the radius of a semicircle is 7 . what is the approximate perimeter of the semicircle ? 
Options: ['a ) 36', 'b ) 25', 'c ) 15', 'd ) 28', 'e ) 37']
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
a