Answer: Option 'A' is correct.
Step-by-step explanation:
Since we have given that
the function f(r) givens the area of a circle with radius r.
i.e.
[tex]f(r)=3.14r^2[/tex]
Put the value of r = 4 as we have to find the value of f(4) .
[tex]f(4)=3.14\times (4)^2\\\\f(4)=50.24[/tex]
Hence, Option 'A' is correct.
