Question

How do you find the area of a circle with a radius of 2 cm?

Answer 1

A= `12.57 cm^2` rounded off to two decimal places.

Or A=`12.56 cm^2` Not rounded off.

Explanation:

Using formula:

Area of a circle = `pi` x `r^2`

Given that `r^2`= `(2 cm)^2`

So we have= `pi` x `2^2`

Which is `pi` x `4`

You will need a calculator to solve it to the exact value, but you can also just use 3.14 as `pi`, it works too, only problem is that using a calculator will give you a more precise value than using just 3.14, so there will be two answers.

Using non calculator equation `3.14` x `4`

That equals to `12.56 cm^2` exact using.

Using calculator equation `pi` x `4`

That equals to `12.56637061`

Rounding off to two decimal places which is `12.57`