Question

What is the circumference of a circle when the diameter is 18?

Answer 1

The answer is `56.57`.

Explanation:

In the process,

Diameter= 18,

Radius(r)= `(18)/2`

`:.` Radius= 9

Now,

Circumference (Perimeter) = ?

According to the formula,
Perimeter= 2`xx (22)/7 xx r`

Taking the equation,
Perimeter= 2`xx (22)/7 xx r`

`rArr` `2 xx (22)/7 xx 9`

`rArr` `(396)/7`

`rArr` `56.57142857`

`rArr` `56.57`

Let's hope this helps you:)

Answer 2

`18pi~~56.55" to 2 dec. places"`

Explanation:

`"calculate the circumference (C) using the formula"`

`•color(white)(x)C=pidlarrcolor(blue)"d is the diameter"`

`"here "d=18`

`rArrC=18pi~~56.55" to 2 dec. places"`