Question

What is the area of the following circle?

Answer 1

`16\pi\:\mathrm{units^2}\text{ or }50.24\:\mathrm{ units^2}`

Explanation:

The area of a circle with radius
`r` is given as
`A=r^2\pi`.

In the question, we're given
`r=4` and asked to solve for
`A`.

Substituting
`r=4` into
`A=r^2\pi`, we get:

`A=4^2\pi,\\A=\boxed{16\pi\:\mathrm{units^2}}`

If we use
`\pi=3.14` as mentioned in the question, we would have:

`A=16\pi=16\cdot 3.14=\boxed{50.24\:\mathrm{units^2}}`