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(3)

Answer 1

F(3), replace r with 3
f(3)=3.14(3)^2=3.14(9)=28.26
f(3)=28.26

Answer 2

Answer: $f(3)=28.26$

Step-by-step explanation:

Given: The function $f(r)$ gives the area of a circle with radius 'r' it can be written in equation form $f(r)=3.14r^2$

To find f(3), we need to substitute r=3 in the given function of area we get,

$f(3)=3.14(3)^2\\\Rightarrow\ f(3)=3.14\times9\\\Rightarrow\ f(3)=28.26$

Hence, $f(3)=28.26$