Question

Find the exact circumference of the circle. please help?
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Answer 1

3rd option

Explanation:

We first need to find the diameter of the circle.

We know this is a square because all sides are marked by a line so this means they are equal. Let find the diagonal of the square to find all parts of the square.

The diagonal of a square is

`a √(2)`

where a is the side lengths of the square.

So this means the diagonal of the square is

`18 √(2)`

The diagonal is also the diameter of the main circle. The formula for circumference is

`d\pi`

where d is the diameter.

So the diameter is

`(18 √(2) )\pi`

or

`18\pi √(2)`

The third option is correct