Question

The function f(r) gives the area of a circle with radius r. It can be written in equation form as f(r) = 3.14r2. What is f(4)?

A. 50.24
B. 25.12
C. 19.14
D. 157.75

Answer 1

50.24

Explanation:

Answer 2

Answer: Option 'A' is correct.

Explanation:

Since we have given that

the function f(r) givens the area of a circle with radius r.

i.e.

`f(r)=3.14r^2`

Put the value of r = 4 as we have to find the value of f(4) .

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

Hence, Option 'A' is correct.