Question

The function f(r) gives the area of a circle with radius r it can be written in equation form f(r)=3.14r^2 what is f(4)

Answer 1

`f(4)=50.24`

Explanation:

We are given the function representing the area of a circle as,

`f(r)=3.14r^2`, where 'r' is the radius of the circle.

It is required to find f(4).

So, we have,

`f(r)=3.14r^2`

implies
`f(4)=3.14* 4^2`

implies
`f(4)=3.14* 16`

implies
`f(4)=50.24`

Thus, the value of f(4) is 50.24.

Answer 2

The value of
`f(4)` is 50.24

Explanation

The area of a circle with radius
`r` is given as:
`f(r)=3.14r^2`

Now,
`f(4)` means the value of
`f(r)` when
`r=4`. So, we will just plug
`r=4` into both sides of the above function.

`f(4)= 3.14(4)^2\\ \\ f(4)= 3.14* 16 =50.24`

Thus, the value of
`f(4)` is 50.24