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

Question

asked Jun 9, 2017 186k views

2 Answers

Roni Castro · Answer 1 · 2017-06-15T15:34:23+0000

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.