The title could be interpreted as a story about a man's dream and the confusion of was he dreaming or did it actually happen. Or it could be interpreted as a delusion a man had and he is having trouble figuring out the difference between reality or imagination.
Formula of circle:
C= 2πr
The radius is half of the diameter, so divide 9 by 2
18/2=9
Then plug in 9 as the radius in the formula.
C= 2π(9)
Using you calculator multiply 2 by the symbol "π" and 9
Exact Form is 18π
Decimal Form is 56.54866776...
