the aggregate of two or more numbers, magnitudes, quantities, or particulars as determined by or as if by the mathematical process of addition: The sum of 6 and 8 is 14. a particular aggregate or total, especially with reference to money: The expenses came to an enormous sum.
The area of the circle by definition is given by: For f (r) = 154: Clearing r we have: For f (r) = 616: Clearing r we have: Answer: a reasonable domain for f (r) is: 7 <r <14
